IME when using any probiotic system, if the alk creeps above 10 dkh depends on what your other parameters are sitting at , it might cause alk burn. If your other parameters are out of whack it will cause even more problems like stn or rtn. Once one colony starts to rtn it is likely that it will create a snowball effect and take out rest of the sps. Also make sure your potassium is in line as the probiotic system stripes it out of the water at a fairly rapid rate.
If I would you I would get your alk back down to about 7-8ish and go from there.
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