You should strive for atleast 1
flow rate in the tank. Given your tank is 150 gal
that comes out to 1500GPH flow rate. I dont know what the flow of your two canister filters but I suspect your short a few hundred GPH
. It also seems that even if you have 1
flow rate there migh be areas of the tank that get insufficent current to keep nasty canyobactor (sp?) from appearing.
For example. I have an 80 gal
tank that is 6' long. I have a 1400gph overflow and a 1250-1300GPH pump on the sump. That give me roughtly 15X flow rate in the tank. But I suspect that after I get done aquascaping with my new LR
I will have to put at least one if not two small powerheads in the tank to provide suplmental current to some possible 'dead' spots.
Some creative aquascaping can hide powerheads fairly good.
Maxijet are good powerheads that I have found to work relivlly good under pressure. For example I have used a maxijet 1200 to pump water up into my tanks from the floor. The head height was about 5' and to my amazment it was flowing at a decent clip for a 195GPH powerhead.
Rio's are cheap and can have problems starting up if they run for a very long time. To correct this just take the powerhead out of the tank and give it a good cleaning. Soak it in vinegar/water solution and then soak it in water and then power the unit up. It should start back up. If not then you will have to take the impeller out and clean it by hand.