calicium hydroxide question

[phyto4life]

I just started using 2 tsp of calcium hydroxide dripped at night from a 2L in a 30G does this sound like it's a ok amount to add?

I have 7 small 2" sps and 60 lbs of LR 1/2 covered with coraline

other then that I was wondering if I should test ph right afterwords at night or during the day or both for the first little while?

Should I drip kalk everyday or every other day providing the ph stay's under 8.4 during the day?

also I was considering using purple up also in small amount's during the day
would this be too much or at all beneficial ?

i'm only planing a small sps population in the future with 20% weekly water changes