<a href=showthread.php?s=&postid=15119962#post15119962 target=_blank>Originally posted</a> by Leonardo_
All the pumps were connected to a Multicontroller. There was actually no precipitation in the tankwater, only in areas with elevated temperatures, like pumps and heating elements.
I guess the pH wasn't that high enough to also precipitate CaCo3 in the tankwater. Therefore parameters Ca, ALK are still in check.
I think the following happenend:
The timer of my T5 lights didn't shut off for two days, reason unknown.
Because of this long light period, combined with the nightly Kalkwasser dosages, the pH raised so high, that CACO3 precipitated in the pumps.
Most of the pumps clogged, shutting down most of the flow in the tank.
The damage I see in my SPS are mostly bleaching because of the extreme lighting period, combined with several cases of STN caused by the lack of flow.
Thanks again for all the reactions, it really gives me new energy to restart things and don't want to make me give up.
Leonardo