personally i would ditch the biowheels. if you have more than 50lbs of LR, i would just convert the whole filter to a fuge and go with option C. if you have less than 50lbs of live rock, taking away the filter pads could cause a biological upset and cause problems
yep, i feed on a random schedule too. sometimes its 7am, sometimes its 6pm. its not good for the fish to be used to a schedule, they may skip eating sometimes because they know it will come again soon
about once every 3 days
i feed my 90g freshwater tank once a week though, the 2 pacu are extremely destructive eaters and im worried they might break something