My tank is a 20 gallon and its about 15 months old. My alk is 16, ph 8.4-8.5, calcium around 460, mag 1500. Nitrate is 6, and phos is .3. Im working on getting the phos down with water changes and brightwell phos e. Im just wondering because most people keep there alk around 8-10. But mines never hone below 12, i dose kalk to maintain high ph and water evap. Im wondering since my corals dont seem bothered by my alk being on the extreme side of high. If I wanted to add new corals what would be the best way to acclimate them? Thanks for any suggestions!