i bought a 10 gallon tank ($7), i bought the Red Sea Floatswitch with solenoid ($50) an old maxijet i had (you can use anythuing as long as it can get up to the tank(free) then i bought some small PVC fittings to attach the maxijet to a 1/4 in tube, that i have through the wall to the maintank($5)and thats all, very easy, i fill it up about once a week, only takes a few minutes a week, i love it! i coulnt imagin going up and down up and down the stais holding gallons of water to dump in the tank, with the float switch it is very easy!
Float switch solenoid, pump, tank, water, bottom, under fuge.