I had similar issue when i first aquired my queen and it comes and go. Later then i observed to be my water quality . The key takeaway is to identify or least correlate the root causes and don't start treating with cocktail of medication
Just get a reputable salt and do your weekly WC diligently. 20 -30% is a good number for LPS. SPS require some testing and calibrate your WC % accommodatingly
These are the 2 flame angels i got yesterday . As i mentioned i was there till 3+ because i was pellet testing all the flame angels; as none are trained due to new shipment. Not to dig further,yes i was the only customer there with the boss. Cheers