I do 4 times per year. For me it is VERY important.
It is basically to show me what I'm not looking at. I do test every other week Ca, Mg, KH, Phosphate, Nitrate... But the rest?
The last test showed me a big lack of iodine, then I started to dose exactly as instructed in ICP results and my corals became a lot more coloured. - I wasn't never going to test or dose iodine if I didn't got that results...
It is basically to show me what I'm not looking at. I do test every other week Ca, Mg, KH, Phosphate, Nitrate... But the rest?
The last test showed me a big lack of iodine, then I started to dose exactly as instructed in ICP results and my corals became a lot more coloured. - I wasn't never going to test or dose iodine if I didn't got that results...