Zoas with swollen bases

thewarbrd

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I've got a little frag that's been in my tank about a month and a half now. Off and on over the last three weeks or so they've been going through bouts where they wont open for a few days, open barely for a day, then close back up. Now the bases are forming huge blisters. I had another frag I ordered off the internet show up looking like these friday, they became snail food last night. I'm assuming this is either some kind of illness or sign that these are dead/rotting away.

The ones in the foreground are the worst off it seems, the open one in the back is starting to form the blister at its base. There's nothing on the fingers where that spot is, it's actually just a couple of the fingers not opening out all the way. I've inspected for nudis and did a 15min FW dip last night, nothing of note came out/off the rock.

Parms as follows

PH - 8.15
Alk - 3.5
Ammonia - 0
Nitrite - 0
Nitrate - 0
Calcium - 400
KH - 12
Salinity - 1.025

I'm not dosing any minerals, every 3 days or so I'll throw in a cap of kent chromoplex, and I have a small bag of seachem phosguard in the sump.

Any suggestions?

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