Looks like HLLE disease to me. Probably wouldn't have survived even in a very large tank and without intervention. Your tank is much too small for a fish like this. Sorry for the loss.
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By basics I’m assuming alk mag cal, and weekly water changes? Correct me if I’m wrongThat lateral line just looks like a normal dead fish to me. The area around the gills too. HLLE usually has head damage too, IME.
Stop doing things and let the biological stuff in the tank get to work. You need to get some film algae, film bacteria, etc. Put away the test kits and just very smartly and patiently feed the fish that you have left. Don't do anything other than top off and the basics for a few weeks.
Basics like top offs to keep salinity stable, checking temp to make sure it's stable, and carefully feeding the fish. No testing for a couple weeks.By basics I’m assuming alk mag cal, and weekly water changes? Correct me if I’m wrong
I think I am going to be getting rid of my tank. I obviously am not a good fish dad, if anyone is in the Denver area and would like to take the risk of having anything out of my tank send me a message. Current living live stock is two snowflake clowns a flame hawk coral beauty angle and 3 fire fish one red one purple and one helfich. No promises any of the fish will stay living. I also have a torch coral that I’m unsure if it’s doing good or not some blue alveopora, two sun corals, my miami chalice, a meteor shower cyphastria, and an assortment of zoas. I also have a 13 gallon tank with a red scooter blenny in it.So today my bicolor blenny died. I am unsure if it is related to the tang. His head is almost completely detached from his body. And he was slightly under a rock… now before you say he was crushed by the rock this rock is completely against the bottom glass of the tank. And cannot/did not move.