LPS flesh die off in the winter, why? Furnace??

Hello,

So now that we are well into winter, my 2 frogspawns and Duncan coral are losing flesh again. The flesh dies off from the bottom up. This happened last winter to the same 3 corals. Then once spring rolled around, the flesh grew back, the corals are were happier and they grew again. This leads me to think maybe it's the furnace. I use natural gas. All the other corals seem fine and are growing...well, not my acans. They never grow. They stay the same, year after year.

Anyway, what are your thoughts on this. I couldn't find anything online about this. And I can't run an air line outside from the skimmer.

Thank you,

 

Any changes is ph?
Any changes in temp?

 

I suspect you'll need to track your pH or ALK values to get to the bottom of it for certain, but chronic low pH or a chronically low alk is probably to blame.

 

Closed up doors and windows in winter can lead to more CO2 trapping in doors, which could cause a pH problem, as mentioned before. Temp swing can also cause problems too. Ive dealt with both of these in the winter time in previous tanks.

 

+1 CO2 buildup can have a serious impact on PH.

 

Thank you all. No temp swings and my KH is at 9. PH is around 8 maybe 7.9.

Can't wait for spring, so I can open windows.

 

We open a couple windows for 15 minutes each day and run a vent fan to cycle fresh air through the house. We've done this for over 30 years, it's good for us, it's good for the house and I'm sure it's good for the mini oceans we maintain, IMHO.