Flower pots often die in tanks that otherwise are in perfect condition. They usually starve to death actually. They are used to being well fed in their naturally conditions. You can actually spot feed them by using a 2 liter soda bottle and cutting off the bottom. You place it over the flower pot and then feed DT live and let it sit awhile to let it get all it wants. This is easy in a nano, but it a deeper tank you have to attach tubing to the top of the soda bottle.