I've been told that my water temp. which was running 76 - 78 needed to be cooler. With the cooler night time temps my water is now running 72 -74, with no deference in the fishes swimming or eating activities.

I have about 50 (four inch) Hybrid Pink Tilapia's and 8 (three inch) Gold Fish, they seem to be doing fine. About 70% will surface anytime I walk up to the tank when their hungry. I read that the optimal temp 74 - 80 for the Tilapia & 65 - 75 for the Gold Fish. I have some extra black pond liner that I was going to cover 1/2 of the fish tank during the day to heat the water. At night I have a spar cover I can put over the tank to hold the heat in.

My system is not fully cycled in yet, my readings are: PH 8.2 / Ammonia 0.25 / Nitrite 0 / Nitrate 60. My question is should I bring the temp up to 75 which is great for both fish types or wait until it finishes cycling in and my PH & Ammonia levels are lower?