Bacteria Bloom or Precipitation

NanoSteam

Active Member
View Badges
Joined
Dec 23, 2019
Messages
216
Reaction score
258
Rating - 0%
0   0   0
Hi all,

I'm not new to reef keeping (15 years) but I am new to mixing my own salt and am in the midst of a new nano tank setup so i figured this would better fall into the new section.

Setup is a basic 20 gallon with just a HOB running filter floss and two Koralia power heads.
Using Bahama oolite live sand topped with Fiji pink.
18lbs of cycled live rock from established reef tank.
Water: Distilled (tested with meter at 0 TDS) and Instant Ocean Reef crystals.
Water temp: 79F
Salinity: 1.025
Cycle method: Used Bio-Spira and dosing 2ppm Ammonia.

I finished cycling my 20 gallon so I wanted to do a water change before adding livestock as my nitrates were high due to the cycle.
At this point my water was crystal clear.

I had prepared a gallon of salt water with left over distilled water a day prior. When it was time to do the wc i just added the salt and water on top of that. I had noticed the salt hadn't fully dissolved. I didn't think much of it. The water did not look cloudy at all in the bucket.

I performed a 40% water change and immediately my water was cloudy. I hadn't disturbed the sand bed at all so I know it's not that especially because during the initial filling of the tank the filter floss was able to clear the sand out of the water column fairly quick and you can see it on the floss. Now my water became cloudy instantly. After over 24 hrs it looks exactly the same with no improvement.

Now i'm trying to figure out if this a bacteria bloom or precipitation due to my lack of knowledge in mixing salt. I didn't think there was much to mixing salt until I had this problem.

Thank you!
 
I had prepared a gallon of salt water with left over distilled water a day prior. When it was time to do the wc i just added the salt and water on top of that. I had noticed the salt hadn't fully dissolved. I didn't think much of it. The water did not look cloudy at all in the bucket.
This explanation of how you made the salt gives me pause. How did you measure and calculate the saltwater you had with the new salt mix and water. There are various calculators online that can do the math very easily for you when your trying to mix different salinities and volumes. Also, salt should always be thoroughly mixed before adding to any aquarium. Nevertheless, I suspect precipitation. Does your equipment , powerheads, heater, etcetera have a white dust on them? If so it is precipitation.
 
This explanation of how you made the salt gives me pause. How did you measure and calculate the saltwater you had with the new salt mix and water. There are various calculators online that can do the math very easily for you when your trying to mix different salinities and volumes. Also, salt should always be thoroughly mixed before adding to any aquarium. Nevertheless, I suspect precipitation. Does your equipment , powerheads, heater, etcetera have a white dust on them? If so it is precipitation.

Thanks for the reply. I followed the 1/2 cup per gallon instructions on the box and used my hydrometer to measure the salinity after i was done mixing. I think you're right that this was my mistake. My powerheads do have a light white dusting on them.

Now i'm not sure how to fix this. I'm guessing a large water change (properly mixed this time) is the only way to remove the cloudiness?
 
Was salinity tested before adding the new water to the tank? If it was and all the salt wasn't mixed, I would guess your salinity in the tank itself is high right now.

If that's not the case, it's from the unmixed salt mixing in and possibly precipitating out of solution.

Going forward, I would add a pump to your mixing container and let your salt water mix for an hour or more. The time really depends in the salt you use.
 
Was salinity tested before adding the new water to the tank? If it was and all the salt wasn't mixed, I would guess your salinity in the tank itself is high right now.

If that's not the case, it's from the unmixed salt mixing in and possibly precipitating out of solution.

Going forward, I would add a pump to your mixing container and let your salt water mix for an hour or more. The time really depends in the salt you use.

Yeah it was tested before filling the tank. I've been monitoring the salinity in the tank and there has not been any spikes.
 
Unmixed salt can have a precipitating effect to salt that is already mixed. Like in your tank.

FWIW, I would really recommend you get a refractometer. They're cheap and the most necessary tool for marine aquaria. I think they can be had for $20.

Also, I always weigh my salt mix. Using a cup can lead to errors. Harbor Freight sells a great little digital scale. I've been using mine for years and also have a 500 mg weight to test accuracy. It's always been spot on. Don't forget your 20% off coupon. ;)

 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
Back
Top