90 gallons is a super easy way to go. Depending on what equipment you get I would say your monthly cost any where from 25 to 60 bucks keep in mind more equipment ( rodi units). How often you do water changes.(metal halide vs t5 vs LEDs) for lighting mh run about 25 month. Heaters if you run 300 watt vs 2 150 watts. Skimmers depending on the pump. Return pumps. If you run reactors or dosers. Wave make or power heads.
All things have there.
My 90 gallon KISS(keep it stupid simple) tank runs LEDs and t5. 2 150 watt heaters, ruturn pump is a mag 24 what's over kill. A cheap swc 180 skimmer.
4 1400 ghp powerheads.
I do weekly water changes. Bucket of salt last about 5 weeks.
This is all just an example.
But over all cost is roughly 35 bucks. I would say.
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