Mazina KM My suggestions are ...

Mazina KM My suggestions are similar to many others. in the first instance consider using black sheeting to cover your pond to reduce the amount of sunlight on the water. Secondly, install a pumping system that will recirculate the water. this need not be expensive, a small high volume, low pressure pump the could run for a few hours per day would work and with careful placement of the outflow there should not be too much disturbance to create sediment that would cause blockages to your irrigation tape.