05-12-2013, 12:08 PM
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They will tend to overflow a bit, especially when adjusted for full flow. AC's have one of the strongest motors of any hob filter I've messed with, extending the intake & doing a 50% water change in a deeper tank without shutting them down is no problem. You'll see a bit of slowing with the flow, where others will shut down with this they just keep running. I've never been concerned with the bit of overflow, but as mentioned keep it tilted towards the tank a bit.
Lid rattle is common with these, I've found that putting a piece of slate on the lid stops it, the grey color blends in nicely.