Flood and drain not draining all the way. Experienced input wanted

I am making sure my system is properly running before I stick clones in it. It’s not draining all the way. I’ve even stuck blocks under the 2 back legs trying to drain water towards drain. Still the water is above channels in table. What am I doing wrong?
Thanks in advance

Do you have a pic.

Figured it out. I didn’t notice there was a riser on the fill line it was sitting to high. Drains dry as a bone now!

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