enough for what? It is all pretty subjective but most people on here would go with the Aqua C Remora "Pro" with Mag 3 or 5 pump, Emperor 400, 80 lbs sand total (you could mix some live on top of playsand), 100-150 lbs LR, 2 or 3 powerheads (maxi-jet 900's are popular). An extensive sps reef tank would require better but the above setup is pretty popular. I'm assuming your not utilizing a sump.