Hi everyone, I recently got back into the hobby after a 10 yr layoff do to moves and such. I successfully kept a 55 gallon mixed reef but didn't want a canister filter and all the hob filtration and skimmers I used to have. I recently stepped up to a pre-drilled 90 gallon deep blue reef ready tank with a eshopps adv-100 sump which I've guesstimated holds about 5+ gallons. My question is that I would like to purchase an auto ATO to keep my sump at the optimal water level as I'm currently adding about one gallon of top off every 3 days or so. I have a ehiem 3000 handling the return duties and it's currently set at full bore and seems to be handling the job fine. I've read a lot of reviews on the various ATO's on the market but am looking for more experienced hobbyists and their input. Thanks in advance, and wow have prices of equipment and everything else in the hobby changed