the tank is a hex 7 so the filter isn't that powerful but does work. could oxygen supply in the water be a problem?
What are the snails in picture 2???
I have 10-20 of these. None of them get to adult size, my problem!!!

What are these???? Edible to puffers???

Not edible to puffers but cool snail.

Another shot of pond snails

Any help would be great!!! my puffers need their snails!!!
