750g tank build

  • We are currently upgrading MFK. thanks! -neo
M

mp3coupe

Feeder Fish
MFK Member
Dec 20, 2008
79
1
6
usa
I built a 750g tank to hold my koi for over the winter months and also for quarantine in the summer months.

(If I had to do it over again, I would use 2x6's just for the base as I had bowing with 2x4's)

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5/8 OSB
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After filling it 3/4's of the way, I didn't like the bow, as I took a sharpie and marked the floor when the tank was empty. I drilled the floor and inserted 2) 1/2 rods
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behind the tank I dropped a few scraps of 4x4s, up against the foundation.
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top and bottom are bolted together

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45mil liner - bottom drain 1 1/2 pvc
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BD gets fed into a 55g settlement tank

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Some what up and running
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Filtration 1.5cft of lava rock
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AV50 air pump creates a wall of bubbles behind the BD, the floor remains squeaky clean
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I wasn't satisfied with the performance of the lava rock, not enough filtration for the load..... So I built a sand and gravel filter.
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Every few days, just give the lower valve a quick open to flush any garbage out.
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This here is the inlet from the BD
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Cut up a grate to keep the rocks off the bottom
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This here is the air wand- cleaner
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Drilled on the bottom of the wand are 1/8 holes to let air pass through
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Filled it with a few inches of 3/4 inch stones and then pea gravel and the top layer is sand. This should get cleaned weekly..will see. I run 2 of these for the pond outside, it does a ton of bio and great for polishing the water.
Chocolate milk anyone?

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not the best shots,
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This is the largest one, I picked her up last sunday 18-19 inches
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(don't over look the black one :)
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How about some outdoor pics?

That dirty water is the stuff that makes trees and shrubs happy....
 
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