Who Gives A Fish Forums

For a 20-high, I'd go with a 100W heater. It's enough to handle the volume without overheating. Make sure it's adjustable, tho. Cheap preset ones can be sketchy.

I've recently added a new tank member - a yellow angelfish - and now I'm worried about my anemone. It shrunk significantly over the past couple of days, and its tentacles are swollen around midway down. I've been feeding it shrimp regularly, so I don't think starvation is the issue.

My current ...