I have used some of the house plants in my wild betta tanks with success. They actually will extend out of the tanks and up the walls close to my windows. I have not used them in any of the Paro tanks as I keep them away from the windows because of excessive light. In the Paro tanks I have stayed with Java fern, Java Moss and a few Crypts. Recently I have been investigating Bucephalandra for use in these tanks. These plants are not readily available in the trade however. They come from the island of Borneo only and are found in the waters along with Paros and wild bettas. They grow in low light and in blackwater I an told (we will see over time). Presently they are expensive to purchase but beautiful. There is some discussion going on that they have been tissue cultured and if that is the case, availability will increase and prices will come down appropriately as they will not have to be collected from the forests of Borneo.