Originally Posted by fizzyface1000
Thank So Much For The Info. I Have A 4ft Tank. Unsure Of Gallons/Litres
There Is A Good Sized Community Of Guppies. Cant Actually Coun Them All.
What you might want to do is introduce a couple of live, hardy plants if you haven't already. Plants might give off more oxygen to the fish than an airstone would, continuing on from "OscarLoverJim" statment. Couple of Java Fern/Vallisneria/Amazon swords???
That is, only if the fish really seem to be choking for air, and are nowhere else but at the top. Otherwise, it may just seem like they're always gasping for air because there are so many of them maybe?