Hi everyone, first post and we’re new to this so go easy on me. 90 gallon fish only. Couple of clown fish, angels, jawfish, and a naso tang. Just bought a beautiful goby and I want to help it survive. We do have minimal amount of copper in the tank (added 2 months ago) and I’m wondering about adding copapods (sp). Will they survive? Any downsides? We have a canister filter TIA