Large amount of Alk consumption

[Accidentalreefers]

Hey, so here are my parameter's
Alkalinity 7.0
calcium - 430
magnesium - 1300
phosphate - 0
PH- 7.8-8.0
ammonia - 0
Salinity 1.025

I'm using a Hanna Alk checker for my Alk readings.
This is my issue my tank isn't that loaded, mainly softies and LPS (mainly smaller frags), i have a birds nest that is 7" by 7" big, a smaller birds nest that's around 2"-3" I have quite a bit of coralline, I've been buffering my tanks Alk to 7.5-8.0 almost on a daily, or over a 2 day period but almost 8 hours later i will check it and it will be down to 7.0 again?? I'm literally dosing 10ml of Alk every single day.... is this normal for a tank to consume this amount of Alkalinity within an 8hour period??? my tank is just over a year old. any feed back would be great. thanks :)...

 

[KrisReef]

IF that is what you are measuring that is normal for your tank. It doesn't seem like that much to me. My Calk reactor adds 45 ml/minute of reactor enriched water to my tank.