I have three of theses on my tank, yes its overkill for a 90, but I have them on the back wall (Bowfront) instead of the sides (prefered Location). They have just come out with the Gen 2 upgraded software, which has even more features, the sync/anti-sync with lagoon crest is still my choice.
I like this company, each upgrade is backwards compatable and brings your pump up the most current model at a reasonable price during the upgrade period. For example the software upgrade is free, you just pay for shipping up and back. And the new magnet kit is $10 plus shipping.
They are expensive, but you will not be disappointed, in the product or customer service.
wesheltonj
90g Oceanic Reef-Ready Bowfront w/ AquaIllumination LED & GHL Profilux 3eX