[mobyfish]

I'm starting up a 180 gallon tank for one marbled cat shark. I have a 75 gallon tank that I will be making into my sump. I have a 1800 gph sicce pump and a 250 gallon reef octopus skimmer. I am worried about properly filtering my tank. I was planning on having a few live rock in the tank for my sharky to hide in and have the rest as open sand. I was also planning on having a load of live rick in my sump to act as my bio filtration but was also considering a trickle filter with bio balls. Since I am designing my own sump I have the ability to do either. Or maybe both? I was also planning on putting a carbon bag in there. Let me know what you guys think and any input helps. Thanks