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"I have a couple of these cabombas in a ten gallon tank. I used to have some in a five gallon tank that died; I'm pretty sure it was from too little light. So in this 10-gal I put in a special grow light and they live well. I guess they have enough light, or is it something else? Anyway, my problem with these plants in the 10-gal tank is that they won't take root. They're healthy otherwise, but they have no roots so my 3 catfish uproot them when they poke around in the gravel for food. I've tried fertilizer and trimming the stem bottoms but nothing works. The stems just have this brown, kinda hard end to them, like flowers in a vase do after a while. I have nuetral to slightly acidic ph, and healthy levels of nitrate and alkalinity and stuff, from well water. It's not really a big problem, but I'm getting tired of replanting them every day. Anybody have help?"