I've been successful in numerous tanks over quite a few years and my mother has over 20 years experience as well.
I understand that canisters can create more nitrates, but I haven't had problems when they are well maintained.
This was NOT a posting asking for help with my setup and I merely asked about the mushroom corals on my list. This is my "blog" posting about my tank, I'm not asking for advice on how to setup my tank.
Now back to our regular scheduled program....
I am considering changing my ideas on the shark. I may consider possibly getting a marbled catshark over a coral catshark, but I'm 100% yet. Reason I might change is 1) I've heard some aggression issues with corals during feeding, which I had not heard before and 2) the marbled catshark seems to be easier to get.
We'll just have to see what makes it on my LFS's saltwater list....
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks