So I need to start replacing my RW-8's as they are failing after 3-5yrs of service (not complaining as they are LOW $$). I need a "in tank" powerhead as I dont have any space around the outside of the tank to do a MP (dry side). The new AI Nero 5 looks promising and relatively compact. I should be able to go from 4x RW-8 to 2x Nero's. Anyone have these in tank yet?