keep in mind too that the mass majority of the mech filtration is handled by the two whisper style doubles. the pads get swished every 2 or 3 water changes to keep them flowing. the 110g was established for nearly a year with perfect water quality... it was after that, and suddenly that the ammonia spiked, with no changes to feeding habits or filter maintenance, or stocking for that matter. im leaning towards something with the tap water, but hopefully we will see an improvement in water conditions with a dramatic decrease in feedings.
oh, and the first time the 110g crashed, i was feeding every other day, just food for thought.