Trying to sort out problems in the tanks and devise improvement plans.
Did first ever ICP test on our 5-year old big tank. Kinda expected to learn bad news like massive copper contamination from pennies dropped in or something, bad RODI, plus off the charts nitrate and phosphate feeding the algae. Nope.
RODI water tested fine except for high Si (+420.6 µg/l), but Si fine in tank water. I have no understanding of the variation - could be negligible. (Also shows Zn a bit high in RO but fine in tank, Ba bit high but low in tank water; ignoring those.)
Tank water shows everything fine except LOW phosphate, phosphorus, boron, kinda low nitrate, iodine. HIGH bromine, calcium can come down.
Salinity 35.87ppt and dKH 7.56.
So, no big contamination but back to my old struggle with algae and bleached corals. Had been feeding corals and shrimp more, but algae species and amount have increased. Chaeto has finally started growing better in fuge section of sump, but mainly lots of hair algae in fuge and return section of sump on walls and foam filter on pump intake, I assume from light spill. Analysis recommended stopping use of GFO, which I have never used.
So as I understand it algae is going crazy quickly taking up phosphate and nitrate, possibly silicate.
I know I need to do water changes. Not sure what else, but weekly water changes is a hurdle.