Emergency with PH after Kalk overdose

[adova]

Hi all,

I refilled my kalk reactor and must have gotten too much or something as the output came out almost pure Kalk. The tank started to cloud up with the kalk and the ph shot to 9.1 from 7.5.

I have done a 20% water change and tried to empty out most of the sump where the concentration was pumped into, but the PH is still at about 9.0.

Is there any recommendations? The fish are started to look bad (at least my purple tang - can't see much of the rest)?

Tank is a 250g with SPS and leathers, etc.

Thanks!

Shawn