Planted Tank Guru
Join Date: Jul 2008
Location: Morris County, NJ
I'm a big fan of RO/DI water. My tap water is absolutely horrid, almost 400 TDS, 15+ dGH straight from the faucet. Since I would like to have the option of keeping fish beyond livebearers and rift lake cichlids I use RO water, remineralized to 3 dGH and almost no KH. Certain plants will also fail to thrive in hard water, even with ample light, CO2, and nutrients. This works very well for me.
Tap water can cause algae in several ways. Certain algaes, like green hair algae, just plain like hard water (the vast majority of places have hard tap water). Tap water can also have nutrients like nitrates and phosphates, which makes it hard to keep nutrient levels low even with regular water changes.
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