A little help please. Put a plate coral in my established tank, all levels and temp 78. In 2 days 100% bleached out. Put another one in last Monday

[Rene fish]

A little help please. Put a plate coral in my established tank, all levels good and temp 78. In 2 days 100% bleached out. Put another one in last Monday, same vendor and starting to bleach out quickly. No other corals close by?? Help, going quick. Thank you!

 

[vaguelyreeflike]

What’s your salinity, alkalinity, magnesium, calcium, nitrates and phosphates?
And what are you using to test these levels? (what brand of test kits)

 

[VintageReefer]

Are you sure that’s a plate coral? Dies it have a center mouth? Can we have a top down pic?

It looks like montipora or a plate formation sps, and requires certain parameters - alkalinity (crucial), calcium, nitrates, phosphates, etc. lighting is important also. Any incorrect item will cause bleaching and rtn / which is overnight death. Acclimation is important also.