rhysiboy
Fish Addict
I always recomend using two powerheads because it will save you a lot of trouble down the road. For starters you can have one permanantly fixd up on the surface keeping the surface clean and giving good aeration and the second one will provide flow for your tank. Also later down the line when you run into cyano I found that direct flow to the afflicted area is the only reliable treatment but you cant sort it out properly with just the one powerhead as you need it for 60 other things . But as people have said you should make your mind up as to what you intend on keeping in this tank because that way the hardware you need will be a lot easier to determine.