Hi there, it's impossible to tell by that picture. Explain the situation and provide all of your water parameters there is a form to fill out on this site, don't have the link right in front of me but we can only guess without any information. Also take a look at my tank setup perhaps might work out better for your fish. Also try Kordon Fish Protector, it is herbal and has echinacea, boosts immune system function, repairs cell tissue and reduces stress. Sending positive thoughts your way - good luck and keep the faith.
It looks like just a big poop. Did the fish pass it?
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Tropical Fish Keeping
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