Feeding schedule is once a day in the morning with one day break per week. Amount of food is... I never measured it in grams or something, but usually I spend approximately 3 minutes on feeding (mostly I spend all the time tracking that everybody eat) and they eat pretty much everything I give.
Procedure of cleaning the filters... They never get clogged or the water pressure decreases as somebody mention as an indication that the filter must be cleaned, so twice a year I clean all the sponges thoroughly, bio media I clean carefully under the shower without moving it around. I never noticed any spikes in tests after cleaning the filters. Filters are not cleaned at the same time, I clean one filter and the next one a month after.