I just got a coralife 125 super skimmer for my 75 gallon, have it insump mode hanging on my sump, can be put in the sump too, one of the best skimmers if your on a budget. And with a constant water level, the skimmer is wicked awesome. Few things the reef octopus have i wish it had but thats where the money difference comes in, i got mine for 180 brand new