Hey guys my Bala pond is Doing pretty good but after water changes it's pretty cold is it best to have the heaters in the sump, waterfall or just keep it in the pond. It takes awhile for it to heat up back. Am using 2 300WATT heaters. My other 2 am currently using for my 1,800Gallon it's getting chilly in the mourning now. So basically where can I put the heaters to make it heat faster, and more effective thanks guys
