I saw the other day that most of the vallisneria was starting to float loose from the pot I'd stuck it into. Then saw one of the kuhlis was constantly going in and out through the slats of the pot- they seem to really like digging in there. In this case the kuhlis had dislodged almost all the fine gravel. I lifted it out and had a sudden idea: what if I turned the pot upside down and planted subwassertang on top of it. Then it could be a nice subwasser bush with a kuhli cave underneath.