Hi! I have a 75 gallon reef tank that I've had up and running for a year now. I've been paying someone to take care of my tank but have been trying to learn to do it all on my own without someone. I recently bought a wet and dry sump with bio balls and had a cascade canister filter running as well. My nitrates have shot up to 160 ppm so I did a water change and went to take the pad out of the sump which was completely filthy and went ahead and shut off the canister bc the store didn't have anything I need for it. So... My question is.. Is it ok to just use the sump? I really don't want to use the canister filter anymore but didn't know if I need to run carbon or anything like that. Will the sump with bio balls and just a blue floss pad be sufficient? I also have a protein skimmer going. Any advice appreciated! Thank you!
and with nitrates that high I would suggest a water change is in order now

