Can anyone recommend a hang- on type overflow for a 90 gallon reef tank? I have a "nameless" one on my 120 gal, that has the curved tubes, except they always need to be re- siphoned ( a Pain). The only one I have at present for the tank is a "Tom" brand overflow, but I don't think the water exchange is enough. The sump/ refugium will be around 40 gallons, and I'll have to find a pump that will be compatible with the flow rate. Appreciate any advice.