ref temperature

hi can any one tell me my temperature in my tank with light on is86f when light go out it goes down to 78f can the day time temperature do harm to my coral and fish i have two tommatto clowns and a sea urc .i also was wondering i have two powerheads in tank very big ones if i turn one off in day light will that harm fish as i have no thermal heater i cant work out how to get temp down with out buying fan systems many thanks

 

What kind of lights do you have, how long are you running them, and how close are they to the water surface? Also, what is the ambient room temperature where the tank is? Shutting down a powerhead would probably increase the temp, as it reduces the water flow.

 

I too have read that running a powerhead can cause an increase in temp...however it does seem quite sensible if the lack of circulation can cause a rise in temp. But if you have at least one running there is still some type of circulation...Is this right guys correct me if I'm wrong.

 

After adding 2 of the Koralia 1'a in my 40gal, the temp actually lowered about 4 degrees. I would think to get that hot (86) it would have to be sourced from his lighting. The only thing I could think of to suggest would be to run the lights less and/or move them higher (corals permitting).

 

hi guys have a t5 light i have been doing some reading i have read that in a coral/fish set up i can have the temp at 81f so i might be worred over nothing but need to ask as the more i learn the more relaxed i become