Cooling down water?

[Steven4est]

Hello,

I live in a tidal canal and have a semi closed system. I run my water from my tank to a 5 gallon bucket and then back into my tank. Every 2-3 days, I drain the tank and pump new water from my canal into my tank.


My issue is my tank is outside and it gets hot some days, how can I cool the water? I currently have a fan blowing on the water, and everything is under shade. Is there any other way to cool the water down?

In addition, is my "semi closed system" idea okay? I would love to pump fresh water from the canal all the time, but my tide gets very low and I don't want kill the pump.


I'm in the process of changing the 5 gallon bucket into a 55 gallon bucket and I am also looking at putting some oyster shells into this new tank. Any other suggestions? Cooling the water seems to be the biggest hurdle right now.

[Crabslayer]

Try using a heat exchanger.  Use the water from canal to cool the exchanger.