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So I woke up and found both of my clowns dead and the tank cloudy. Actually, I noticed them hiding in their favorite corner near the MP40 unusually, and not eating yesterday night. (also noticed my royal gramma and lawnmower blenny were not around, as well as the oddity with the brittle star). But since this is not too unusual per se I chocked it up to random strangeness and did not think much about it).
Anyway, it looks like the bacteria, Dr. Tim's Waste-away, and the fact that I've been running the MP40s lower than normal since the cleanout led to too-low ORP and lots of animals died. Still not finding the RG and LMB; will probably look but am not optimistic about finding the carcasses at this point.
I suppose I will now do a 100% water change. I did treat with seachem prime.
Lesson I suppose is to be very careful with these things; that being said I've used waste away many times before without issue. I believe I used the recommended dosing, but of course am second guessing myself now.
Anyway, this is probably the end for me and the tank, and probably for me and the hobby for the next several months. . See where things are in a week.
If you added a bacteria product then noticed the cloudy water it sounds like you had a bacterial bloom. I did not see a skimmer listed in your OP. With a bacterial bloom pH can start dropping pretty quickly and the oxygen can be used up by the bacteria. Skimmers help significantly oxygenate the water. Lower flow can also cause less gas exchange. With low oxygen fish can start passing away pretty quickly. An ammonia binder is a good call. Doing a large (100%) water change is not a bad idea, but when changing that much water you have to be sure to match parameters as closely as possible. I induce a bacterial bloom a couple of times per year and it really helps reduce nutrients as well as some of the fine detritus.