Some chlorine removers will give off sulfer if they get mixed with the right stuff. matt kaufman wrote: > > Two possiblities I can think of: > 1) when the substrate in the tank gets really, really anaerobic, you'll get > hydrogen sulfide bubbles when the substrate's disturbed, from the decaying > organic matter. Nasty smelling stuff. Probably not good for fish. Have you > uprooted any plants. Have the fish uprooted any plants? Any > decorations/rocks/driftwood moved? > 2) You said the smell came from behind the tank. Could anything have fallen > back there and gotten damp/moldy? > 3) The smell's coming from something else in the room. Time to catch up with > that laundry? :-) > > _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member