I enherited a 125 gallon tank. The pet store in my area has really been patient with helping me set up all the systems for the tank, but i don't understand the different pump systems. I 'm :notsure:but i have two pumps inside the tank and there's a eheim system beneath the tank. i really don't know how that works but when i hooked it up it sounded horribly like a clicking noise. I have 6 fish now and i'm sure that i'm going to need that eheim pump. I don't know much, okay i don't know anything about the systems, but i sure enjoy watching the fish every night, and i've gotten to be really crazy about the tank. What should i do? :notsure: