I have goldfish in my pond, and as soon as there is a blockage, they are covered with spots because the filter can't work. Thank God, my friend is a plumber, and he helps me with a clogged drain pipe every time. I don't trust other plumbers, once one of them poured all the dirty water that was stagnant in the pipe back into the pond and some of the fish died... How do you deal with such problem? Also, tell me, if it is possible to settle koi carp in a small pond with goldfish? Will they live in peace, koi is still bigger than gold?
