Im setting up a 500gl system. Its a 300gl and 120gl displays with a 125gl sump.I have an ASM g5 alreadybut dont think it will be enough for this system with a decent amount of fish in it. I have an opurtunity to get a second G5. What do you all think of running 2 skimmer vs selling my G5 and getting like a G6 or something.