Just a thought on chillers. I have been toying with the idea on building a diy version using a Halfords cooler that can plug in. Coiling the inside with 16mm pvc tubing and fitting glands to the outside. A cheap return pump fitted to the tank. Also to get temp down in hot weather can fill the box with ice or alternatively a pc cpu cooler?Big tank in the house so you can sit and watch the tank the only thing is keeping temperature down chiller are 250 300 pounds that’s not for me I want a cheap opinion. The stuff I got yesterday probably in a shop would of been over £ 100 pounds you carnt beat it . Definitely in theses hard time and I actually see more movement in this tank than BTA tank . Good luck