Well i've recently bought a 4-5" Rhom and put him into a 24x15x15 (tempory) the water was from an established setup and the filter was semi mature and i seem to have got nititres on the rise, it isn't too bad yet at 0.50 mg/l. but he was gasping (plus it's been very hot over here) so i added an air stone and he doesn't seem as happy as he used to. So i've done Daily W/C and added some cycle. Is there anything else i can do? Some people have said that salt helps lower nitrite levels? I'd hate to lose him.