Rather than jumping to a solution at this point I think you should provide more information on your system. It’s 65g mixed reef suffering from high nitrates. OK what else?
A) Are your other waste parameters high? i.e. ammonia, nitrite, phosphate?
B) What media are you running in your Fluval?
C) How often and what volume of water changes do you do?
D) How many fish and coral in your 65g?
E) What have you tried so far to help yourself? (Increased water changes are step 1 and reducing feeding is step 2 but what able other things like cleaning your Fluval bi-weekly? Etc.)
F) Does anything work to lower your nitrates?
G) How much do you feed? How often?
H) Do you have a lot of green/brown algae?
I) What sort of display items do you have in your tank? Just rock?
J) Are you on city or well water?
I’m on board with the idea of tossing that Fluval in the can, mostly because they are junk vs. the belief that all things nitrate spring from a canister filter. There are loads of people that run canister filters successfully. They may take a little more maintenance than a sump but if you have more time than money…
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