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i have been using AB+ since day 1, if that's the case not sure what change.This is going to sound weird to a lot of people. My acros that were encrusting and growing well, RTNd once I started feeding AB+. The moment I stopped AB+, RTN stopped as well. Now I have frags that have flesh on half the skeleton and have not changed in more than a week.
There could be something else at play that I am not aware of. My 3 acros RTNd, while another acro + 2 SPS were not affected + Zoas were not affected.
Another coincidence is that I was also coming out of a dino outbreak.
1-2What’s TDS before DI?
I did something similar and installed a big blue housing for a chloramine carbon block before the membrane. Very happy with that decision.The only thing jumping out at me is possibly the RODI. 1 of the times I had acros dying I had Chloramines blasting through my carbon blocks. I got one of the $80 Hach kits and figured out I had to change out carbon block #1 every 2 months or chloramine got though. This was when my tank was a 40 breeder and I was changing 5g a week! You are free to borrow the Hach kit btw.
What carbon blocks are you using and how often are they changed?
Chloramine has been one of the "bad guys" mentioned by many posters in this thread. Chloramine is not an ion - it will not be detected by a TDS meter. TDS meters is basically a conductivity meter - it simply measures the ionic strength and translate this to ppm total dissolved solids. According to ppm TDS - you could have 1000 or 0 ppm - but you still not know your content of chloramine - it just not detect that. You have done IPC tests and they says - as I understand - that harmful metals is absent. What i think you are saying is that your RO/DI unit has been running 7/24 - do you have an emergency drainage at your RO/DI drum?A big thanks to everyone's inputs, i greatly appreciate them! that includes mellotang, even i dont agreed with most of the stuff he said. He did one way or another push me toward the road to find one of the issue, hopefully that will turn out be THE issue.
Never Assume, it makes an butt out of myself in this case.
The input after the membrane is 2, check with 2 meters, hand held and inline. after the DI is zero, also test by 2 meters, hand held and inline. same as always. when i did the reset, i empty both RO/DI and salt mix drums, i check TDS of the RO/DI drum, it was like 5.
I setup a solenoid to turn on my ro/di unit every 2 days for 4 hours.
The reason to do that is to limit the initial burst of the high TDS water when the unit just turn on, my RO/DI drum feed my top off container. tunze ATO is extremely sensitive, even remove 1/2 cup of water it will turn on. the solenoid limit the extra TDS going through. yes i have 2 DI chambers with my RO/DI unit, i change them out when the 2nd chamber got down to half. i guess that will change now.
After digging through my stock pile of carbon blocks. i found a few matrikx blocks. so i turn off the solenoid and unscrew the sediment filter housing, well, the water wont stop coming out after i loosen the house. as soon as that happen i already knew what one of my issue is.
I test my water in the RO/DI drum, my house tap is about 230, my ro/di bucket is 200.
the solenoid must fail right after the reset, because i turn off the solenoid to change out all the filters each and every time.
well, a few lessons learned here.
1. Don't ever assume. lol
2. Find a better solenoid, it should have fail close, but not in this case.
3. Need a better plan to deal with RO/DI on/off.
i am using one universal block(1micron) and one matrikx block(1micron) now, just in case water supply does contains chloramine and change out every 2 months instead of 6.Chloramine has been one of the "bad guys" mentioned by many posters in this thread. Chloramine is not an ion - it will not be detected by a TDS meter. TDS meters is basically a conductivity meter - it simply measures the ionic strength and translate this to ppm total dissolved solids. According to ppm TDS - you could have 1000 or 0 ppm - but you still not know your content of chloramine - it just not detect that. You have done IPC tests and they says - as I understand - that harmful metals is absent. What i think you are saying is that your RO/DI unit has been running 7/24 - do you have an emergency drainage at your RO/DI drum?
As the last poster - I would change from the black bucket (pro salt) to the blue bucket instead.
Sincerely Lasse
Sounds like your DI is doing nothin.i am using one universal block(1micron) and one matrikx block(1micron) now, just in case water supply does contains chloramine and change out every 2 months instead of 6.
when i said 24/7, i mean the water supply to the RO/DI unit is open. i have float valve in the RO/DI drum to stop the RO/DI unit running once the water reach the spot.
but everytime the ATO top off, it will drop the level in my ATO container and RO/DI drum and cause the RO/DI unit to run and let high TDS water into the drum. that's why the water within the drum TDS was 200.
after i drain all the water out of the RO/DI drum, the newly make RO/DI water TDS is 3 now. Checking the TDS within the RO/DI drum is part of the water change process now, to ensure dont happen again.
I will switch once i am done with all the black bucket i have, IDing the high TDS in my RO/DI drum is good, but i cant be for sure know this is THE casue, so i only want to change 1 variable at a time to see if thing start to turn around. otherwise i will have to start the whole process again to eliminate equipment one at a time to find the cause.
While I believe its possible its your RODI, I also think we share some things in common. SPS STN from bottom up, dino outbreak, and black bucket red sea salt. I lost all my SPS (years worth of growth) during my dino outbreak, and after dinos disappeared many of my LPS melted away. Now I can't keep commonly kept/easy SPS. Zoa seem happy as do fish, rockflower nems, crustaceans, and coraline of many colors.
Im suspicious of the salt because it leaves what appears to be black mold or mildew in the bottom of my saltwater container and frothy slime on top of the water if I leave it for a week with a small powerhead in a brute. Red Sea advised me not to mix up salt water days in advance, but my gut says this is no bueno.
If I find a solve for mine, I'll report back.
pH: 8.25
Alk: 9
Ca: 350
Mg: 1450
NO3: undetectable (I dose a tiny amount of NO3 to keep dinos away, but not brave enough to bring it up because I believe stability is more important)
PO4: 0.08
Inline RO test 2 TDS in after pre-filter and carbon, 0 out.

the DI is doing something, when you just turn on your RO/DI, your TDS will be high, in my case is about 85 before DI, if i have 2 full chambers of DI, i think it should bring it down to zero, but i let the 2nd chamber of the DI get down to half before i change them all out, that's letting 40 TDS water getting through.Sounds like your DI is doing nothin.
I did, when i did the reset, i started the tank with microbac 7 and continues to use microbac 7 until 2 months into the tank cycle.Like you, I had issues unexplained, racked my brain, killed tons of frags, and documented in my old build thread. I couldn't keep ANY sps. I started dosing a Probiotic bacteria, and wala, started having success. My rock, while dead rock originally, was at 2 years wet when I started with bacteria, as fyi. There is a great thread about bacteria being a missing component in some tanks who struggle to keep sps alive. Worth a shot... no pun intended, lol...
Hope you get things on track, fingers crossed for you![]()
You not got a bypass valve to flush the TDS creep?the DI is doing something, when you just turn on your RO/DI, your TDS will be high, in my case is about 85 before DI, if i have 2 full chambers of DI, i think it should bring it down to zero, but i let the 2nd chamber of the DI get down to half before i change them all out, that's letting 40 TDS water getting through.
the reason doing that was when i was in school, i dont check it as often. i change my plan from when the 2nd chamber start to change color to 2nd chamber get down to 1/2. i didnt change back after i am done with school, which is mistake #1.
I did, when i did the reset, i started the tank with microbac 7 and continues to use microbac 7 until 2 months into the tank cycle.
which bacteria did you use? sorry, kinda out of the loop for the past few years due to school.
I dont, since i have the RO/DI unit on apex, it turn on every 2 day for 4 hrs, i will be at work most of the time.You not got a bypass valve to flush the TDS creep?
cool, i will add that to my next order.I used AF Probiotic bacteria, I haved used nearly all. I also hear good things of PNS as well. I still use to this day, I believe it helps keeping nuisance algaes at bay. Corals seem to love it with full pe post dose. I suspended their carbon source, as I dose P04 and N03. I use the bacteria to outcompete nuisance, giving corals access to biomass before skimmer removes excess.

