ok have a nice active and peaceful (for a mbuna setup) african tank. normally the fish are always up from watching you, playing with each other, and generally being cute lil nutters. yesterday they suddenly became very spooked, any movement would send them scattering for their caves, went back to normal after about an hour or so, but did the same again today for a bit (about 1/2hour each time)
water params = all perfect, 0 0 >20 7.8
I am thinking the heater might be shorting out sending stray voltage into the tank. is there any easy way to test this???
and no, no kids have annoyed the tank either