Koi Pond failure, Leaks, Green Water, Oxygen Levels? Broken Pump Do I give up?

First ponding video after my build. In this video I show you the problems I have run into. The day I had to leave on a trip, the pond has lost a foot of water. The pond runs for 5 days with minimal filtration which causes a green algae bloom. I then show how I battle the algae and turn things back around. Stick around to the end and you'll get a feeding frenzy with the fish in Lake Mead.

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Pond size 12"x8"x5" Approx. 3590 Gallons
Box-weld liner
Pond walls Earth and Railroad ties (sleepers).
Railroad ties 7"x9" 3 layers stacked to get an above ground height of 27 inches.
Dug down 33" and install a Koi Toilet 3" bottom drain.
Overall water depth 58 inches.
24"x48" glass viewing window.
Filter system #1 DIY Sieve into 3 55 gal barrel moving bed system.
Filter system #2 Pond Skimmer fed into a Bakki shower system.
Might try to incorporate some aquaponics in down the road.