Quick setting concrete with a color additive in marine tanks?

[AquaticEngineer]

Wanted to get some of your perspectives on the use of quick setting concrete in marine tanks.

I'm going to be coating large diameter PVC pipes in quikcrete with a dark color dye additive to make it look like wood.

The end goal is to create some light weight, easily stackable, immitation pier pylons for my coldwater marine tank.

Has anyone used quick setting concrete with a color additive in their marine tanks before?

[TellyFish]

Sounds like a cool idea. Any reason you don't just use wood pylons?

I have used portland cement in my reefs with no problems. Best of luck, post pics!

[AquaticEngineer]

Thought about real wood, but the weight and the tannins released from the wood wouldn't be worth it.

Also, the tank they are going into is 4ft tall, so I need to do them in stackable pieces that I can put in one at a time.