I have a friend (no really...) who has right now a (submersible in refug) "Coralife Cone Skimmer" and is looking to replace it with an "Aqua EV-240 External with Mag Drive 12 Pump (AC240M)". His concern is if and when the current skimmer he has goes "haywire" it will pollute the refugium. Ideas? Suggestions? Set ups? Schematics? Any / all will be helpful. Thank you!