need help please

Stability is key, more so than the actual temperature. If you find the temperature changes by more than a degree of two per day then you will need to take action. But a clip on desk fan will do plenty for cooling down the tank.
 
yea but i don't have my mh lights hooked up yea how much will they raise the temp, if it is already at 80, "2 bulbs"
 
That is going to depend on how high you have lights about the tank, air flow in your house, how long you leave them on for, its going to be impossible how much adding the metal halides will change the temp
 
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