I have a 300 gallon tank my stock will consist of a gar, 3 pikes cichilds a pair of jags, a midas, a GT, maybe a pair of JDs and a clown knife. I may add more but this is what i have so fair in my current tanks. My question is which filter is better for a well stocked tank of large fish? which can i connect to my overflows if i want to go that route and still use my overflows? (I plan on adding a sump but only if i have to if i need more BIO) What do you guys/girls think i should do?