08-01-2013, 03:30 PM
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Just piping in to say that if your cartridge is clogging too quickly than that's a sign you need a better filter (or bigger) and...with that I agree with what Agent said.
It saves you money on the long run if you don't have to keep sinking money into a cartridge replacements. Even if they are cheap that adds up. I have long become the strong opinion that cartridge based filters need to just die.
While AQ may be one of the best HOB's, Fluval puts out some well put together Internals if you look around. It's hard to make too much of a recommendation not knowing the size tank, set up, and inhabitants.