So I got called unexpectedly for an 8 days trip, I was worried about Lapis surviving with only the sponge filter, but he did great. Tank was a little gross, but not too bad. Gave him a water change, then left the filter media from the Hagen floating in his tank for about 3 days or so, to give it a chance to pick up some beneficial bacteria.
Installed the Hagen Mini, and he HATES it. Flow is way too strong for him, even on the lowest setting. It throws him around the tank. Perry would probably love it (he always rides the filter stream) but I couldn't use it for Lapis. I tried putting a piece of sponge over the end, but it just made the water come out of the aeration pipe (too blocked at the outlet I guess) Anyone done this successfully, and what did you use?
So far the sponge filter seems to be keeping things under control, so I don't want to mess with a good thing, but I'm guessing a 'proper' filter might be better? Do any of you just use sponges in your smaller tanks? (1-2Gal)