Sorry to agree but your tank is way too small for those tangs. What other corals do you have close by the zenia. They may be getting stung or under a chemical attack.
I can't have Zenia in my big tank as they just shrivel and die, but they grow like weeds in my 50. Exact same water just different corals.
__________________
250 gal display tank plumbed directly to my wallet
|