thanks for the compliment bro!
haha.. you really have 1001 questions..... Gouldian, better dun pass him your mobile.... haha ........
just joking... whatever i can answer, i will lah....
my take is that if you want to keep corals, you need a chiller.
Can use fan, but evaporation will be high => salinity will fluctuate quite a lot especially if yours is a 2 footer and below.
LED lightset does produces heat, just that the heat is directed upwards instead of onto your water surface.
So the casing will be hot, the surrounding air will also be hot.
your pumps produces heat, your wavemakers produces heat.....
So overall ambience temp + pump heat can increase your water temp quite a bit.