"A. Scott" wrote in message
...
History:
Situation:
Ammonia is spiking (~4.0 ppm) while feeding is very nominal. Nitrites
are non-existent. Nitrates about 15-20ppm. Temps are ~81; Ph ~7.0.
It seems like the tank is trying to start cycling again...is that
likely the case? If I've killed my bio agents, does this mean my
biowheel is dead and needs to be replaced?



Never replace a bio-wheel unless it is physically broken.
It sounds like your tank is in the middle of the cycle to me. Do daily water
changes to keep the poisons down and keep monitoring levels. When ammonia
and nitrite have been zero for more than a day or so, you're cycled.

b