Good article on the how, but doesn't really give the why....
All corals extract minerals from the water to generate nutrients. With most corals like softies (zoas, palys, mushrooms, polyps, leathers) and LPS
(hammer, torch, frogspawn), regular weekly water changes are plenty enough to replenish the minerals that are consumed. When you start getting into SPS
(montipora, millepora, acropora), they tend to consume these minerals faster than normal water changes can replace. It's at this point that either more water changes are required, or begin supplemental dosing, and dosing is a lot cheaper than salt.
In my case, I don't have that many SPS
, and my normal dKH
was at roughly 9.5 to 10 and calc was 400, which is well within parameters. Talking to Convict, he just began dosing not too long ago and said he noticed an almost immediate difference in his tank, so with some extensive research, I decided to give it a try. After slowly bringing my tank up to around 12dKH/calc 440, I noticed almost an overnight difference in both my montipora digitatas & birdsnest.... the polyp extension was much better, the growth tips increased, and the color difference was about unbelievable. On top of that, even my LPS
(trumpet, candy, & acan) appear fuller, and my number of coralline algae spots have almost doubled in the past two weeks.
Dosing isn't something I'd recommend for everyone. If you're only running softies, it's really a waste, and you run the danger of seriously screwing things up..... But if you're getting LPS
heavy and/or getting into SPS
, it's worth researching.