Is 30ppm co2 too high for discus?

[riverlanddiscus]

I have ordered the following co2 drop checker and now have concern with how to get to this high ppm. I run a Sera controller which the co2 is bubbled directly into mt eheim filter intake. It is currently set for 6.4, Kh is at 4 degrees but algae prob is big. Diatoms and thread and hair algae are getting a hold. I have never seen pearling but growth is good. Any opinions much appreciated.

[riverlanddiscus]

Forgot link. oops! Apologies if posting this isnt allowed. Please delete if needed.
http://www.calaqualabs.com/Doublecheck.html

[riverlanddiscus]

Hi I am assuming that everyone is stumped as well.
I will try and fingers crossed.