If history is any indication, it will be back at 7.8 tomorrow morning. It won't stay at 7.5 for long.You can, if you wish. I wouldn't do anything else until it reached 7.8 - 8, then drop it to 7.5 or a bit less. Lower TA levels will slow the pH rise but not eliminate it. Minimize aeration - that is what really drives pH rise because of CO2 outgassing.