Newbie here

Have been lurking/learning for a while as I changed my tank over from Malawi Cichlids to Discus and thought it was time to register. (Lots of good info here BTW)
I have 2 small tanks and one large one. 1 15 gallon is still cichlid fry, 1 15 gallon is just for plants and the 270 gallon tank is still aging for the discus. It has 50 neon tetras, 4 barbs, 2 plecos, 1 beta (or is it siamese?) fighting fish and 7 or 8 corys in it now. In 2 weeks I will head to a fish auction and pick up a school of discus! I am really excited!
I still have lots to do, I am mounting a FBF and a CO2 system next week to keep the plants and the discus happy.
Any suggestions/input is greatly appreciated as I am a discus newbie.

Thanks-Jason

Thanks!
It is a cement tank poured in the wall. The caves were made by stacking bricks to get the general shape then forming cement around them until they were smooth. Estimated weight: LOTS!

Edit: In the picture of the tank room the cement on the left side is the back of the big tank.