The pics aren't super clear but to me it looks like a feather and is totally harmless. If you already got lots of gba in your tank a few red ones won't be that bad. If you don't mind crabs get a few emeralds....they do a good job when they are small and hungry for food. I added 1 into my 75g and it makes it's way around the tank eating the shorter algae aswell as the gba.
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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