!!!!??? It's happening again!

[Seriak]

People tend to underestimate what a change in Alk can really do to a tank especially if you are running Bio Pellets. Whenever my Alk started to approach 8 my tips would burn and I would get STN on my SPS. When I corrected it over a couple days the other way with water changes I sometimes ended up with RTN on some SPS.

[straightrazorguy]

+1 on the Alk swings. I've had SPS RTN on me with less of a swing than what you mentioned.

[brotherd]

I think for sps keepers this is a very important topic / thread that needs to be followed closely.

[brotherd]

Crazy thought but do you use a home cleaning service or anyone in the home spraying anything that you don't know about?