I have never used anything but tap water and i dont get any algae growth at all. Here is an even bigger shocker i only declorinate when i do water changes. when i top off, which is multiple times a day, i used straight up tap water from the bath tub lol. I know its not the smartest thing but i know what my system can handle and it doesnt bother it. I haven't lots a fish or coral in a very long time due to poor health so there is no reason to change anything. If i had an RO system hooked up to my tap i weould use it but i dont feel like investing in one at this time.
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