Bleaching BTA's

Whip316

New member
i have several (11) bta's in my tank and they all seem to be bleaching at the same time really. its a 40b and i got 6 roses and 5 green. the green ones are fine, but the roses are turning light pink. and my flame tuned a light link and yellow as well.
my parameters are all dead on. i keep the tank at 78 anf my lights are a tek 4 bulb fixture with 2 ati blue and 2 ati blue plus. my zoas are fine and my sps are good too. i did have a favia bleach too. all the fish that is in the tank is a pair of latz clowns and they play in all the larger nems. the critters are some snails, pep shrimp and a horseshoe crab. i test it often and i dont see any spikes or any rise in parameters. i thought my lights were getting old and that was the cause so i recently replaced the bulbs in the tek fixture. i do have a 20l sump fuge with cheato and some lr rubble in it.
any ideas? i have had the tank up for 2 years now and the nems been in there for months and just started to bleach last month. i got nems in other tanks and they are fine as well. the one that is doing the best is over 14" wide and is part of the same clones as the other roses.
 
What type of lighting??? Or if you change lighting this can cause it too... Need to acclimate them when changing new fixtures...
 
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