Help me deduce this

toothybugs · 10/16/2015, 07:29 AM

I picked up a trio of Maximas at the end of August. They never opened very fully from the start and since then have retracted a bit. They still open every day but not a lot, two of them open maybe 3/8" and extend the mantles only to the rim of the shell. The other opens maybe 5/8"

I think my flow is okay, they get indirect SPS flow, and my chemistry is keeping some sticks going:

Salinity: 1.026 (refractometry)
Temp: 78-79
Ca: 420-430
Alk: 8.1-8.2
Mag: 1450ish
NO3: < 5
PO4: < 0.05

Lighting: 2x BML 20K strips w/ 75deg lenses @ 57% fixture strength (max 50% whites and 60% blue/ UV) for 9h daily plus 1h either side for dimming (blue/ UV only)

Pretty sure nothing is pecking at them and I can't seen any critters on the mantles. But I could be wrong, I will admit that.

Thoughts as to what else would be causing the retractions?

Bogue Chitto · 10/16/2015, 05:38 PM

I'm not sure but the nitrate may be the problem. If that is not, try moving them closer to the light and see if they do better.

10/16/2015, 07:29 AM	#1
toothybugs In Memoriam Join Date: Aug 2013 Location: The smallest county in Illinois Posts: 1,986	Help me deduce this I picked up a trio of Maximas at the end of August. They never opened very fully from the start and since then have retracted a bit. They still open every day but not a lot, two of them open maybe 3/8" and extend the mantles only to the rim of the shell. The other opens maybe 5/8" I think my flow is okay, they get indirect SPS flow, and my chemistry is keeping some sticks going: Salinity: 1.026 (refractometry) Temp: 78-79 Ca: 420-430 Alk: 8.1-8.2 Mag: 1450ish NO3: < 5 PO4: < 0.05 Lighting: 2x BML 20K strips w/ 75deg lenses @ 57% fixture strength (max 50% whites and 60% blue/ UV) for 9h daily plus 1h either side for dimming (blue/ UV only) Pretty sure nothing is pecking at them and I can't seen any critters on the mantles. But I could be wrong, I will admit that. Thoughts as to what else would be causing the retractions?

10/16/2015, 05:38 PM	#2
Bogue Chitto Registered Member Join Date: Aug 2015 Posts: 960	I'm not sure but the nitrate may be the problem. If that is not, try moving them closer to the light and see if they do better.