I've been experiencing some issues with my alkalinity being consistently low. I have a 60 gallon mixed reef, with about 10-15 different types of softies and mushrooms, about 4 acans, 1 large hammer, 1 open brain, and only 2 SPS
(red cap and stylophora). I don't think my system demands high calcium or alkalinity, but I could be wrong. I also use IO's Reef Crytals.
My alkalinity has been running around 6 dkh
usually just one week after a water change (I do bi-weekly 20-25% water changes), but calcium levels stay around 420-450 and magnesium around 1400. Other parameters are:
Nitrates: 5-10 (I know that's a little high)
My acans used to do really well, but since changing from T-5s to LEDs about 2 months ago, 3 out of 4 of them have not been opening fully. I can still see the flesh and they still have a feeding reaction, although the reaction is much weaker. All other corals are doing fine, except for the ever-temperamental toadstool mushroom.
I tried dosing baking soda, which brings up the alkalinity temporarily, but even after a water change it usually drops back to about 6 dkh
. Does anyone have any theories as to what's going on? Do you think the acans not opening have anything to do with the low alk