Alright, so Im going to setup a tank for a project. I would like to put some kuhli loaches in this tank. This is a 3ft 50 litre (13 gallons) with a sand substrate approximately 2 1/2 inches deep. It will be planted fairly densly with rice plants. There will be 5 female fighters in this tank. It will be heated. It is 9 inches from the water's surface to the top of the tank which will be covered by the provided cover glass. They cant escape that can they ?! O_O The water is 6 inches deep. There is no form of cover like driftwood, caves or ornaments, only the plants. They will have plenty of soil to dig in. The reason why i am getting them is because i would like them to dig around and stop any of that anaerobic action happening in the soil and they are pretty interesting fish. If they will survive fine in this tank, what would be the best way to feed them. How many fish should i put in a tank this size? I know its a minumum of 5. Thanks for any advice.