hi all,

I have a newly established aquaponics system based on a s/steel 2200litre dairy tank and 10 flood and drain grow beds. the system is working well with 200 thriving jade perch and bunches of veggies growing very fast. the jade perch are a tropical australian fish that do not tolerate temps that drop below 18 degrees celcius. I want to construct a solar water system to keep temps no lower than 20 degrees. Winter daytime temps here are usually around 22-24 degrees, night time…