I've had a fantastic peppered cory in my 22g for about a month now- today i cleaned my filter (no water change, last done 30% 2 days ago), shortly afterwards i found him/her? floating upside down at the top of the tank. thinkiking it was dead i got my net out... which caused the fish to swim away. However, moments later he was upside down again at the top of the tank.
i did notice some red patchy spots in the middle of his underside, and what im guessing is his anus is also red. im trying to get a picture now.
Please help!
i have another smaller cory in the tank, who seems fine at the moment.
lso in there are : 7 Guppies (2m 5f) 5 platys (2m 3f) 4 black neons 1 regular neon tetra, 1 kuhli loach and another loach thats just plain brown.
Also a couple of random snails.
i did notice some red patchy spots in the middle of his underside, and what im guessing is his anus is also red. im trying to get a picture now.
Please help!

i have another smaller cory in the tank, who seems fine at the moment.
lso in there are : 7 Guppies (2m 5f) 5 platys (2m 3f) 4 black neons 1 regular neon tetra, 1 kuhli loach and another loach thats just plain brown.
Also a couple of random snails.
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