I think that my filter is failing. The last couple cleanings I have given my tank I have noticed a horrible seaweed smell and what looks like massive amounts of white poop all in the gravel. My fish seemed okay before I changed the water. I stirred up the gravel and gave him new water and now he is acting lethargic and hiding from the light. I noticed some poop on his leaf which I have never seen before. I got a decent picture does anyone know if this is normal