I have a branching frogspawn in my 24 gallon. It is about softball size when it expands. I have 150 Mh lighting and it is in the sand on one side of the tank. It loves it there, especially because I keep it on that side by itself. It stung and killed one of my kenya trees a little while ago. But other than that, I love it. It is a nice addition to just about any tank.