NateHanson said:I do the trash. There's probably no danger with the drain, but I try not to send any tank stuff into the sewers. Perhaps you've heard of Calerpa taxifolia? It's a weed that was introduced to the california coast, probably by aquarists, and now is a significant environmental problem in that area, and in the northern mediteranean, where it is outcompeting, and smothering native species, and the animals that graze on them.