I am upgrading from a 20 high to a 29. I have a AC70 that I am planning on using on the 29 and a penguin 150 on the existing tank. I am thinking at least until the AC70 media develops BB of using them both on the 29. Maybe long term or maybe I will switch out the penguin at some point with a sponge filter, so I can easily set up a QT. (or just add a sponge for QT purposes.) I would like to have some kind of redundancy. Does that make sense? Initially I was running just the 150 and the airstone, then I added the power head for extra oxygen following nitrate issue. If I use the two filters, powerhead and airstone and add the AC70, will that be too much in a 29? Is there a good, better, best way to layout the equipment including the heater on the tank? i.e. should the HOB be on opposite ends of the back of the tank, near each other, would it be good to put the power head on one end to create some flow. So now that is a lot of equipment and I don't know the best way to deal with it. Stocked with tetras and harlies for the time being. Thank you for any ideas. Appreciate it.