I am upgrading one of my 10 ga. tanks to a 30...which currently has a purple chiclid, mickey mouse platy, and a green tiger barb. I am adding 3 moretiger barbs and my platy had babies so soon 3 or 4 more of them will be going in the tank with mom...( dad jumped out of the tank yesterday ...and I also want to add a female chiclid and possabably a discus. Would the discus be too much for this 30 gallon? I'm thinking of having the tank.gravel out of the 10 gal and adding sand and driftwood...would this be a good mix of substrate? how hard to clean sand? Thanks for your input?