There are certain hang-on-back skimmers that waaaaaaay over-rate how big a tank it can handle. Seaclones & prisms are ok for small tanks, but anything above a 33g would probably be way underskimmed. If it works for you, great. But in general, these low-end HOB skimmers are useless, espeically if you follow the manufacturer's guidelines.
For instance, I think Red Sea states that their Prism Pro is good for up to 300g. I'm sorry, but that may be ok if the tank has no fish or livestock in it, but I wouldn't trust a PrismPro for anything larger than a 65g at the most.
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