I think the holes in the back will get clogged up and not work well.

There may be wood , rocks, and plants that might block any holes from access as well.

I think this may be a good idea for people who have bare tanks and are breeding and have many tanks to deal with.

I really don't think it's going to fly, esp for the price you're asking. I think I can do a much beter job with a siphon.

I'm not trying to be mean, I just don't think this is practical. PK

And it sounds like it would be a eye soar.