My 180 is under filtered and i want to add more filtration. I'm broke currently so looking to do it for as cheap as possible. Right now I am running an eheim 2217 and fluval g6. I don't really like either filters and wold like to do a sump. However my tank is not drilled and I have no idea how sumps work or how to set them up. So any sump info would be highly appreciated. is it even possible to hook one up to my tank without drilling into it? my other option is to save up for a nice canister filter like an FX5 to go along with the sump or just trying to save up for two FX5's. any advice would be greatly appreciated.