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well, my kh tester said saltwater will be around 8-10 (units) of KH, and i measured around 6 or 7. the brand of the test escapes me at the moment, but basically you add drops of solution until the water turns from blue to yellow, and the number of drops is your degree of KH. is this low or should i not worry?
my ph is around 8.4, which is weird. in the past year it has never strayed from 8.2.
i recently moved to a new part of town and have a feeling that the tap water is different. i don't plan on investing in an R/O unit. i've been thinking about buying distilled water from the grocery store though.
i have a hair algae problem going on right now.
i change water every 3 weeks.
corals i have include a brain coral, tree coral, polyp colony, and mushrooms, which are all doing excellent except the tree coral, which is doing OK (i think this is partly because i dropped the polyp colony rock on top of it 3 weeks ago (oopps). it's definitely not dying though, actually looks like it's splitting).
You may want to consider dripping Kalk. That would up your Alk and Ca level and maintain them. You will need to get a test kit for Ca though if you wish to do this.
The Kalk will also precipitate out PO4 which may be causing your hair algae problems.
Although since you are using tap water I am sure you have a ton of nutrients in there for algae.