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One main things I see is the filter is not going to be enough to handle a 55 gallon tank. Maybe a 2nd very large sponge filter will be closer to hanmdling the bioload but an HOB or a canister is really going to be needed to handle that size of tank.
I also wonder if the glowlights were frequesnting the other side of the tank and were exposed to an ammonia concentration that the other fish didn't get.
Get the test results when you can but until then, try to keep up with water changes as they will help to keep the water a little more clean and also combat any mini cycle you might be having. Remember to add dechlor to make sure that the chlorine doesn't kill the bacteria you have in the tank.
I know that most know this but even I forget sometimes.
I also wonder if the glowlights were frequesnting the other side of the tank and were exposed to an ammonia concentration that the other fish didn't get.
Get the test results when you can but until then, try to keep up with water changes as they will help to keep the water a little more clean and also combat any mini cycle you might be having. Remember to add dechlor to make sure that the chlorine doesn't kill the bacteria you have in the tank.
I know that most know this but even I forget sometimes.
