Hello everyone. I'm new to ponds. We just bought a house that has a existing pond. It's about 30x10x3. It has a tetra pf2 bio filter and a oase 5.1 filter also. The pond has 2 white gold fish about 10in long and three white koi average of 14in long. I was wondering if that is enough filters for the size pond and amount of fish? Also can we add a couple more koi? Thanks for your input .