Originally Posted by
Harveythekoi
I was refering to the drain in the bottom for cleaning. Not the outflow pipe. The holes should work, if not cut some slots in a pipe, that gives a lot of area. What size pump are you using? The 2" may not handle all that with a gravity flow out. I have a 4" slotted tube to a 3" exit pipe and the water level rides high. You'll also need to screen that overflow, the floating media will go with it.
When you first add the K1 it will float high for a day. Once all the little air bubbles get off it will start to work better then. When ripe they will perform even better.
Garrett