ITC-306A-Really need some help with settings for first time user

I would like to keep my aquarium at 75 degrees F all day and night. I use a canister filter with the heater enclosed in the canister. I have the heater set for 75. I have no issue setting high and low limit alarms. I have set the Continuous Heating Time to 3 hours. I need help with the TS1 and TS2 settings and the differential value. Any help would be greatly appreciated. Thank you.

Hello,
Please note that the ITC-306A maintains a temperature range; it cannot be fixed at a single temperature point.
The relationship between ITC-306A T1 and T2 is:
When the T1< T2, T1 is the heating start value, T2 is the heating stop value.
But when the T1>T2, T2 is the heating start value, T1 is the heating stop value.