Hi Rick - Thanks for the advice, but I'm not sure if it's that easy, but you make very valid points.
Sadly, I've only been running Zeo, bacterial/carbon dosing, GFO and Probiotic salt for 1.5 weeks now. All of the corals deaths happened *before* I implemented those temporarily to clean up the tank after months of poor maintenance. The deaths also all happened *before* poor maintenance; I had lost all hope for making a beautiful tank of almost two years of running only live rock, Nopox, chaeto, skimming and 10% water changes with red sea coral pro like everyone has suggested.
Right now for corals living in my tank, I have some ricordia/Rhodactis which are all very very happy and are 3x the size of when I got them, and two tiny little blastomussae who have not grown at all in the last year. I feed them all a varied diet of AF Ricco food, Reef Energy A+B and whatever they can catch.
I feel like I tried what a lot of people were suggesting, but that it didn't work. What do you think? Any suggestions on algae control?
Here's exactly how I would handle the situation you are in.
1. Triton test
2. New refractometer! It might be as simple as your salinity killing everything. Those hydrometers with swing arms are virtually worthless. Get new test kits, use regularly/liberally
3. Remove GFO
4. No probiotic salt (use their regular salt if you want)
5. Stop carbon dosing
6. Remove zeolites
7. Wait
Let's talk basics. You need to be able to test (with reasonable precise test kits) what your water parameters are on a regular basis, and keep a log. Here's why, for the last 2 years your tank has been giving you clues as to what is going on and you've missed them. You have to test regularly to understand trends in your tank. Testing only when there is a problem doesn't really tell the whole story.
Ok now you need to describe what you mean by poor maintenance. Even a dirty tank can have too much filtration and there be litte to no available nutrients in the water. If you mean algae is in the system and it "looks" dirty, that isn't always the case. Neglect of routine maintenance occurs to everyone at points in life, it isn't the end of the world.
Let's dispell this myth for good. Algae present in the system does
NOT determine whether your operating a Ultra Low Nutrient System. If you have microalgae in your aquarium, no matter the nutrient levels,
IT WILL GROW!!! Your corals will starve, but some algae (bryopsis, derbesia, GHA) will continue to live, inspite of it being a ULNS. Nutrient levels only play a part on rate of growth, tanks that don't have algae, don't have algae because it isn't present. Regardless of their nutrient levels.
We can get rid of your algae, take a picture and post it so we can identify it. It may be a simple as dosing fluconazole and it all goes away.
You say you grow Chaeto, do you get any growth from it? Or does it just stay the same or disappear?
The fact that your blasto hasn't grown in a year is a pretty good tell tale that it isn't happy. Rics and mushrooms kinda play by their own rules, most mushroom grow like weeds.
Continue your 10% weekly water changes. Check your alkalinity daily. If you have undetectable NO3 and PO4 then your alkalinity needs to stay below 8dKH and above 7dKH. (Test your waterchange water's alkalinity and make sure it is where your tank is, if it is WAY high, you can't add it t your tank. SPS don't like spikes in alkalinity. (The skin bursts like a baloon). Sometimes it only takes a few hours for it to happen sometimes it takes a day or two.
Which brings up a very important point. The symptoms of how your corals have died is VERY important information. Without it, basically anyone can only provide shots in the dark.
Are you using a RO/DI? Only 0 TDS water being used?
How tightly is your house buttoned up? No one has addressed a potential CO2 issue. Another reason that descriptions of how each type of coral died is important. Are there factors in your home environment that are affecting the tank? (Are some of these deaths seasonal? Do they occur more frequently when the house is all sealed up for the winter). These are all factors that could be playing into your lack of success and ultimate frustration.
All of these things are fixable but your current course of action is not going in the right direction, it is actually confounding the problems. Modern tanks can be filthy pig styes to the eye, but the water can be SOOOO clean that almost no corals can live in it, if they can they don't prosper (like your blasto).
Triton test is utmost importance. Find out if you have heavy metal contamination etc. But while you wait for the results do the other 6 things on my list. (What do you have to lose?).
Unlike Aquaforest, zeovit, or anyone else offering you a "program" I'm not trying to sell you anything. I want you to be successful and have true joy in this hobby, instead of frustration. (Other's here do to). I promise it will work.
DON'T FEAR THE ALGAE!!!! It's fixable. Take a picture and post it of the algae. Once it's gone it will make everything else much easier to deal with.
The way to solve this problem is to address the issues of the environment one at a time, until we figure out which ones are leading to your corals suffering.
Order a salifert NO3 test, a Salifert KH test kit, a Red Sea Phosphate test kit (or hanna ULR Phosphorus tester). And test test test. When you see something other than 0 for NO3 and 0 for PO4, jump up and down because your tank will be recovering. Then it will just take time and some careful application of some of the tools that you already have.
