So update! The are loving the space! I saw two little fishies chasing each other this morning. The big one definitely chases the little guy but the little one will turn and attempt the baby flare lol. Then its a stand off and they circle a bit but then the little guy gives up and runs off! it's so cute. Don't worry there is a mess of java moss, 3 silk plants, and two IAL to hide with in there, if the little guy really wants to hide he can. And as the water goes up I'll add more plants.
I only have about 5 gallons in the tank but spread over a 20 thats a lot of room. I plan on adding a gallon today.