I'm experiencing the coral bleaching as well. However, I think that was self-inflicted because I've caused instability in my tank over the last month.
- First, I tried to set-up a refugium (before I decided on zeovit) in conjunction with NoPOX (which was already in use for about 8 months). Unfortunately, the refugium started growing a mixture of chaeto and cyano. The cyano was stinking up the room and was an immediate dealbreaker for my wife, so I cleaned out the sump.
- Second, I bought some live rock (about 150 lbs) and added it to my already established system. The rock sat out for a week before I was able to 'scape it into my tank (This wasn't true live rock. It was man-made rock that was sitting in saltwater for a few weeks before I bought it.) After a week of not seeing a NO3 or PO4 pike, I started the zeovit.
- Third, for about 2 to 3 weeks before starting zeovit...I completely stopped the NoPOX (thinking it might compete with the zeo).
I started with about 60% of the zeolites, as recommended when first starting. I also ran the reactor 3 hours on and off over the first weekend, then switched to 8 hours on and off as my schedule allowed. I placed a ball valve on the reactor to ensure it was pushing out about 50 gallons per hour. And I've been dosing the recommended amounts of zeobak, zeofood, and zeostart.
The corals bleached at the very start of the zeovit switch. Softies and a few SPS are doing great (the colors are really popping), but most SPS faded. For example, I have a green birdsnest and a purple birdsnest. The green one has turned into a cool neon green, but the purple one has turned completely white (as in the green stem is white and the purple polyps are still extended but completely white). Other corals that have bleached still show a hue of their original color.
I'm guessing they will come back in time, but wanted to see if others have expereienced this or can offer any helpful suggestions.