I would leave the bottom open as well. I imagine 500 gph will be plenty.
The water flows through the lava rock and out the holes on the bottom of the pot.
I thought your original thread stated that you wanted to use a strawberry pot. Strawberry pots have got holes all around the perimeter, so having a drain in the bottom is sort of moot, ce n'est pas?
(Chicks dig it when I talk French)
Mine was not. I had the pump off the floor. The pot was pretty nasty at the end of the year. I just threw the lava rocks away, clean out the pot and stored it in the shed til the next year. If it's going to be set up all year round, it would be better to have the water go clear through.
Yes falling down into the bog would be great. One other thing to consider is is the water prefiltered at all? You don't want to senda lit of debris into the pot because it can clog up the small holes in the rocks, which makes the bacterial less effective. I'm not saying it has to be prefiltered, but it would be better.
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