Thank you for your info! Can you help me with another question? I'm using a mix of larger rocks (previously used for turtles) and smaller rocks as a substrate. Do you think the plants will survive in this? I wanted to purchase more plants (that are actually aquatic) but I don't want to if they're not going to survive in the substrate. I already have everything set up though and don't want to buy more gravel and start over unless I have to. I would also like to add more fish, but I don't want to put more fish in there if i'm going to have to tear the whole thing apart.