I am about to transfer my current setup into a 20l with a 15g sump. I'm having trouble figuring out what return pump to use and I was wondering what your recommendations/ suggestions are. The bottom of the 15 to the return outlet is alittle over 3ft. I have an MP10 so flow in the tank from the return pump is not an issue I but I still want a decent amount in the sump for a mantis and macro that will be in it. Thanks in advance!