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Ah, that makes sense - thanks. I pulled out the airstone, and will be heading to the store for some powerheads once the parental unit gets a chance to. I guess I'm going for about 1000 GPH more movement.

But if adding an airstone didn't fix the problem, why would adding powerheads? Also, if it's just an oxygenation problem, why would one clownfish be gasping at the surface, but another be fine? I'm sure you're probably right, but being a newbie, I'm curious.

Ok. The powerheads add up to 550 GPH.

I could probably use some more water movement - I have two powerheads and two filter outputs. I tried adding an airstone yesterday to see if oxygen was the problem, but the one clownfish is still gasping at the surface. As far as temperature, I thought that much temperature variation was too much?

A bit of background: I've had a 70 gallon FOWLR setup for about 9 months (my first saltie) with 70 pounds of live rock, assorted inverts, and two clownfish (added about 6 months ago). Recently, I've noticed that both clownfish have been acting listless, and one in particular has been sitting...