hi again,think pond is about 3000 litres,its hard to calculate as its shelved,filter and pump setup seem good so far. i need to bury the filter up to its head to hide the monstrous thing and setup a waterfall setup also. ive added plants over the last 4 weeks and now added 4 fish for the time being, i lemon goldfish,1 shubunkin,i golden orfe and 1 ghost koi all about 4 inches long,,i want to add rudd and a tench later on once pond is more mature with plants,,what size of pond is your filter running on may i ask? cheers