I got two oto cats a week ago for a brown algae problem, but they don't seem to making a large dent in what's there. I am wondering if I am just expecting too much and need to wait longer? I have fake plants and some plastic logs which are covered with the stuff. I can see it growing on the glass too. I have read some forums saying their oto cats devoured the brown algae within several days. But mine seem to like to hang out mostly in the area where my filters are jetting water (I've read they like current), and don't seem to be fully cleaning the brown algae even in that area. Maybe they aren't sensing it very well? I'm also trying to monitor my oto cats health, and don't understand what is meant by full bellies that I see people writing about. I'm told they should generally have plump stomachs, but am not sure what that truly means. Also, I have 3 skunk cories. The largest seems to be more active than normal, and is swimming around a lot. It's tail seems to be frayed, but there's nothing in the tank that would nip it (golden white cloud minnows, red-tailed rasboras, and oto cats). I don't see signs of fin rot, at least from the pictures I've seen on the internet. I'm worried that it might not be doing well. Is there something that I can add which will strengthen the health of the fish in general, and maybe treat the tail? My water chemistry is fine, and the tank is fully cycled. I do 20-25% water changes every week, treated with Amquel plus.