Last night I filled my tank and put in the filter and heater. The filter I have is a Duetto filter and it is surprisingly quiet. At first I didn't think it was working but it was. I have an AquaOne heater that is very accurate. It has a thermometer on it, but I have another one at the opposite side of the tank, and it is very accurate.
Acctualy I don't think it has started cycling yet. It's only been set up a week.
This is the tank I'm going to put the corries into (which are currently in my Q tank), and I was going to put a betta in there with them, but I've noticed recently that my lfs doesn't have bettas any more so I went to another two and they don't have them ither. Today I asked the manager at one of the stores why they don't have them any more, and he said that nowhere around here will have them anymore because there is something about the water over here that bettas can't cope in, and that all bettas we have over here have died after a few days of them being here. :'( :'( :'( :'( I really wanted a betta, but doesn't look like I'll be able to have one. Now I have to rethink what I want in the tank. :'( :-\
No, the heat shouldn't affect the cycle. My guess is that there's not enough food to deteriorate and create ammonia. You might want to either add more, or I would suggest throwing a piece of shrimp (human type) in it. That's what everyone I know does. Its too hard to judge how much flake too use.