Yea when I first started the tank I used tap, the switched to RO/DI and am still battling a GHA problem, I have it down to only 1 rock now. I got hurt at work Nov 18th and they fired me, no comp has kicked in yet and im broke, dont have enough money for gas to get to the only store close enough that has RO/DI water. So distilled is .49 a gallon at the grocery store and I switched to that. Its only a 14g biocube so luckily its not costing me much for my water changes with the distilled.
I just wanted to make sure distilled was a decent substitute for awile....im really tired of picking GHA off the rock for 2 hours a week! Dont want it to spread after all this!