my friend got a nano tank setup from the lfs and wanted me to house his new perchace till his tank was ready for for the critters. we thought this was a sponge but maybe a cucumber? cucumbers are more mobile though, right? kinda like a slug? this thing has a hole in the top and one in the side, either large enough to stick my pinkie finger in...water refraction makes sizes hard to tell properly. what would be the proper care for this thing. btw my lawnmower has since chowed down on the pretty algae i was hoping would spread to the rest of my tank.