Originally Posted by littlea8
okay cause mine is fluctuating by like .4...so its really confusing...i guess ill just keep testing before turning the light off at night...
If the tank was a year old, I'd say a 0.4 fluctuation is a bit much. But in a 2-month old tank, it's probably to be expected. There are many things that will change pH (that article melosu linked to lists quite a few!) but one of the big things is biological activity. When our tanks are new, there's a LOT of activity going on in that little closed ecosystem. Think of it like those old DIY cruise controls you bought that could never hit a constant speed. They were either too fast, or too slow... never where you set them. (Gee... I just dated myself there with that example, didn't I?!) That's a lot like what's going on in the tank right now. Everything that's alive in that tank (including bacteria) is trying to find just the right level to be at to stay alive. And that can cause swings in pH. That's why if you were measuring your pH during your cycle, it was all over the place.
should i keep adding the PH buffer?
I wouldn't. I made that mistake when my tank was about the same age as yours. It caused me headaches when I was ready to add coral and started trying to get my alkalinity and calcium levels where they should be. Struggled with that for a while because of all the buffer I added. At this point, I'd just do maybe double up on your water changes (twice per week versus once per week, etc.) and keep an eye on things. Also give that article melosu linked to a good read. It's the best one out there on how to deal with pH issues.
[Edit: Oops! The link melosu posted wasn't the article I thought it was! Here... try THIS article!