A few months ago I put a mango pit into my Viv, now it has grown all the way to the top of my 24inch tall exo. I also added some avacado pits and they are about to sprout. I think that given the lack of soil volume the plants won't outgrow the tank. And, if they do start to out grow just cut them at the base and start fresh. So far, I like the mango tree and will be trying it in other vivs as well.