I just switched to a canister filter a couple of days ago from an HOB. The purpose was to improve mechanical filtration and reduce surface disturbance (for my plants, hoping to preserve some CO2).
But how will the fish get oxygen-replenished water if there is no contact with the air and no bubbling or anything to speak of? Should I add an airstone or something?
I feel like such a newbie right now. I know plants provide oxygen (but I'm a bit overstocked right now because i'm housing some fish in there temporarily) and an airstone is bad for plants...but...help! I just see a couple of danios hanging around at the surface and some tetras seem to be breathing more rapidly than usual. So now I'm worried. And it doesn't take much for me to start worrying : )
Edit: Oh! And there was .5ppm of ammonia in my tank yesterday...I figured no need to seed the bio media in the filter because bb should be residing everywhere in the tank, right? Maybe there's a dead fish in there or something. So I did a 40%wc and now there's no ammonia and just some nitrite. Again, I'm such a noob.