planning to add a uv sterilizer as part of my system but not sure what size sterilizer would be best based on pond size, which is 15 ft long ,10 ft wide and average depth of 3 1/2 ft,
looking at a 18 watt tetra or a 36 watt tetra ??
looking at a 18 watt tetra or a 36 watt tetra ??