I need some help with my water because I can't seem to get my Ph to get stable. I am able to get it down to 7.0 but then during the day it gets up to 7.6. I just recently set up the tank...it is about 2 months old. I am using Ecocomplete for my substrate. I am injecting CO2 and I do have a Milwaukee Co2 controller. My tank is a 92 gallon corner tank. I would like to know if there are any tests I need to do in order to help you provide me with any help or information. I do use R/O water to do water changes and use R/O right to put some trace elements back into the water. My tap water is at about 8.0 straight from tht tap and is pretty hard tap water. I am just keeping small tetras as far as fish go. I am having slight algae problems and am trying to figure out how to stablize my water and get rid of the algae issue. I would appreciate any help or information you could give me.