PM sent. So with a 125 gallon tank and 1" piping would be a good pipe to go with? 4 were listed and I want to make sure it'll do the job, and do the job right. I was thinking the 3300, but I'm not sure. 780 GPH seems like enough, but then again I'm a newbie. I still need a heater and another powerhead. Is a 300watt heater plus a 150watt enough? Since the heater is going to be in the bin (sump) do you want a heater that will be good enough for a 125 gallon tank? Do you want more? Maybe less? Sorry for a 1000 questions, but it's for a living being.