Aquaponics - Heat stress

This is a bit of a worry.

It's a 32 degree c day out there and fish tank water is already 30 c. The air temperature in the grow house is 40 c, and we get days of 46 c+ ever now and then.

My first bulk bean experimental planting cup is showing some serious signs of heat stress.

As are the coz lettuce.

The tomatoes on the other hand are loving it, and don't understand what all the fuss is about.












I'm not really sure what to do about it.

I draped some shade cloth over the grow house yesterday, but it actually made it hotter. I think if I leave an air gap it will work, but dark coloured shade cloth touching the grow house roof absorbed a lot of heat.

I think I'll try to add a frame and perhaps a water spray with a temperature probe to start the spray if it gets too hot.

I sprayed some water around and the temperature dropped by around 7 degrees, so I should be able to work something out.