I live in a ground floor apartment in a big city. We have 11 tanks including a 125 gal. and a 330 gal. My husband does water changes twice a week. Some tanks drain to an outside drain, those that can't reach the street drain into to our bathtub. I see the detritus and soot going down the drain. Last week the tub drain was clogged. I think it's from the water changes without a strainer in the drain. He refuses to use a strainer and denies it's from the aquarium water. Anyone else have issues with clogging drains from aquarium water?