EasyPro: Tranquil Decor: Natural Top Basalt Three Pack Column Kit | 20' 27' 35' with 48' Basin, 1000GPH Pump and Light Rings portable stand docks and can harm fish

docks and can harm fish and wildlife in severe situations

Check out the UWD Waterfall Diffuser for a lower profile weir assembly

As a general rule

3/16 inch -- For larger fish

Minimum Operating Depth: Vertical Orientation 1HP - 32in

EasyPro: Tranquil Decor: Natural Top Basalt Three Pack Column Kit | 20' 27' 35' with 48' Basin, 1000GPH Pump and Light Rings portable stand docks and can harm fishComplete kit for easy, professional results! Tranquil Dcor Real Basalt columns have unmatched simple beauty. Perfect for creating a bubbling feature in a landscape or indoors, these columns will provide years of enjoyment. Each column is core drilled with 1 1 4 (32mm) hole from end to end, the last 1 1 2 is enlarged to 1 3 8 (37mm) to house optional light ring. Basalt columns are also available individually. Natural top columns make for a beautiful