I have a small set up. 140 gals total. I sealed it last winter and kept temp at 60 degrees. I put 6 3 in Koi, and 8 comets and a few minnows in it last July. The Koi are 8-10 inches now the comets 4/5. Plants and upper fountain run April through September, frogs are back this year.. I have an all in one submerged filter that discharges through a second submerged filter tub.
Everything is going well, the main oval is in need of some cleaning, there is algae coating everything
But not clogging anything up. What's the best way to vacuum a set up such as this and would a small sand filter be useful in maintaining water clarity. Thanks all.