Slowly Dropping pH, Calcium & Alkalinity Levels.

So I have added a about 7 small mini Acropora colonies (more like large frags about 1.5 inches x 1.5 inches into my aquarium since the water parameters seemed stable enough and over the past three weeks my water parameters have started to take a dive. I've also noticed that a few of the Acropora colonies seem to be suffering from burned tips. No I have a very minimum bioload as there are no fish in my aquarium and I feed only twice a week. But I am curious what could be causing the drop in pH, Calcium and Alkalinity. The only thing I can think of it that I don't have enough surface agitation to break up the slime film on top of the water. I don't have any accurate means of measure but I do believe it getting worse. I can't get enough flow on the Vortechs to break up the surface without causing a sandstorm. Would this build really have a profound effect on my levels dropping (obviously the calcium would be in relation to the alkalinity)? I do not have a sump and if I need more surface agitation I was considering placing in to Tunze Nano Streams Aimed constantly at the surface. Any thought?

 

Your corals are absorbing it.You must dose to keep the levels up.Including Magnesium.

 

+1

Stony corals utilize those elements to build their skeleton.

 

Thanks guys.