+1 on this. I used supermarket water to get setup on my 28 Gal and it cost me $50 ! You then need several gallons every week for water changes etc. Before you know it, you'll be way over the cost of a simple RO filter system.
Be smart, buy one right up front and save your money.
Oh, and the quality of supermarket water can very dramatically. You will quickly find that having your own system (where you can control the quality) is worth a LOT if you've got algae problems from bad water.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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