Well if the water is ok it doesn't have to be. But if it isn't you may won't to clean the filter well and perform small 10-20% water changes every other day to rectify the problem. Use tapwater treated with a stress coat and dechlorinater. How are the ponds filtered?paul_v_biker said:oki dokey
what should the water be replaced with....rain water or tap water?
we have a very large rain water tank by the way B)