A friend of mine uses the 820 model, and it pushes a fair amount of water for the price and the amount of electricity it uses.
But there are some reports of these pumps seizing up in reefs running with high calcium levels; nothing like the old exploding Rio pumps though.
I just put one in my tank last week. I really like the flow, it's a wide flow, so it seems to cover a large area without blowing stuff around too much. It's kinda bulky in my 55, looks huge to me, but i am already planning on getting another.
yeah me to, if i but in three into my 150gal i can then remove the 5 maxi jets i have and sell them on ---- to recoup some of my funds invested in the big boys, plus anytime i can get extra hardware out the the tank the better right!!!:jumping: :jumping:
I bought 2 M620 for my 55gal. I have sugar size DSB and it doesn't blow the sand away... I provide a good gentle glow, and i can see things floating in the middle of the tank (which will be picked up by the skimmer) ... really cool investment i think.