Originally Posted by absolutangel04
I can certainly put holes in there. I can also elevate the bottom of the the tube. Thanks for the advice. I got the tank free and I am trying to fix things myself rather than spending more money. Would a chunk of clean foam from a craft store work or do I need a special sponge?
I have made my own with sponge from a craft store, when I cut the hole in the sponge I only went part way through so that the bottom was closed by the sponge itself. If you cut the sponge into squares and stack them on top of each other with the tube holding them all together through there centers they work well. They will try to float however and you will have to put something on them to hold them in place. You can hot glue them to a rock to use as a base, that will also keep them in place.
I use them in my brood tanks as they are baby fish friendly.