I have used the adv refugium 300. It does not flow well in my opinion. I had to valve back my pump a lot. And the way it routes water not all the flow will go to the skimmer. Also I used an Eheim 1262 pump it barley fit in the pump section and the ATO float level just barley covered the pump. I replaced it after a few months. The water flowed slowly through the skimmer section which is were the probe holder is so every time my dosing pump added ALK the PH alarm would go off.
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