So I have a older Red Sea Max 250 AIO. I really like the rounded corners and enclosed hood. I have upgraded to AI primes in the hood to keep the heat down. Near perfect except that for the rear sump. Its too small and the oem skimmer sucks. I do not know if the glass is tempered or not so drilling is not really an option. Has anyone ever used an Apex DOS in water change mode to create a remote sump? I know it seems like an expensive option, but I already have an apex and an extra DOS.
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