In preparation for being out of town for several days I did 2 water changes in 3 days. I did a 20% on Tuesday night, then a 40% last night. My pH has been a steady 7.8 since my tank cycled (about 2 1/2 months now). After the double water change it was reading a 7.4. I have dwarf gourami, angelfish, Harlequin Rasbora, glass catfish and yo-yo loaches in the tank. Should I be worried about this change? If so is there anything I can do to help? Thanks!