Best thing/plant for them? Java Moss. Let it grow wild and watch the White Clouds one day spawn on it..and later you will see what looks like mini Neon Tetras- baby White Clouds glow. If you have enough moss and wood,adult White Clouds will allow the young ones to go unpreyed upon. I did that in a 50 gallon. Reminded me of livebearer keeping.
Need a picture on the back of the tank and some plants. Water Sprite (Ceratopteris thalictroides/ cornuta) is a good floating plant that can also be planted in the gravel. The baby white clouds can hide among the leaves of the floating plants.