My preschool has recently set up a betta in an approximate 2l acrylic tub to help with settling a child who has separation anxiety, and has tanks at home. Problem with the preschool is running a filter and heater in a glass tank is a safety issue. I talked to them this morning and explained that they are just like any other fish and need heat and filtering, but they are concerned about the glass and having power cords stretched out with outlets constantly in use. So far, he has gravel and they are using water conditioner. I know they will keep the water pristine - probably a cup or so change every day or two. I will take up a live plant this afternoon, and a small ceramic pot that my old betta, Nelix, used to love. They're not a filter, but they may hold at least some good bacteria, and the plant might help suck up some waste. They want to do things right, but are limited. If I add some of my gravel that is well established and put in this pot, and also perhaps some cycled filter noodles, could this cope with the bioload of just one betta? I'll tell them to do a cup of new, conditioned water each day, minimal feeding, and put in a live plant to help feed off the waste, could this tank stay healthy enough? They are actually hopping to only need him there for a couple of months at most until this child is settled, and then they may very well retire him to a new home where he can have a filter and heater and stuff. Any tips?