Here's one vote "for" the cannister filter. I've run one on my 45 for years with no problems. But as everyone here has said, you have to keep it clean. It's the build up of detrius in the foam filter that causes the problem. I clean mine monthly with a new filter (washed) and I also run a bit of carbon in a bag as well. I did run live rock in there but I stopped as the detrius buildup on it was just as bad as the foam and much harder to clean.
Go ahead and run a cannister, but like the rest of your system you have to take care of it.
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250 gal display tank plumbed directly to my wallet
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