Thanks for your input. I have plastic canvas around the filter base, makes it easy to take the entire filter out without disturbing the gravel and rocks around it, but I never thought about tule. I wanted a waterfall in the aquarium, thus the reason for the build up around the filter (although it makes it just a waterfall, too much gravel I think to filter it). But I may end up redoing it. I did add some water to make the water part a bit deeper (not much, but maybe an inch) and so far they are staying more of the land area. If they seem to like deeper water, I'll make sure it's deeper. Right now, it appears like they prefer it to be more shallow.





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