1.500.000 litres

[Ardeus]

I not sure yet about the best option: Let the sunlight in directly through a transparent ceiling or use the cover to make it more diffuse. Does direct sun light pose any problems? I know that in a regular tank it's not a good idea. What will happen in a space this large? It will probably turn completely green if there's enough CO2 and phosphates. It's good that you mention the lighting problem, cause my main concern will be to avaid excessive algae growth.

Although many malawis are veggestarian, I don't think they will take care of the problem.

 

[BillyZ]

well it depends on what you're looking for. If you want the inside to mimic a natural environment then let the sun shine in. Natural ponds etc have algae and plants growing all over them. You'll just have a constant battle of keeping your viewing glass clean. With that large of a tank the acrylic will likely be 1 inch (2.5cm) or more thick. Not many magnet cleaners work at that thickness, of course you could probably shop around for some specialty magnet cleaners... otherwise you're going for a swim for maintenance


Honestly, what I would think would give you the most help and information, is to find any local aquariums and see what you can do about talking to one of their keepers. Find out about equipment, upkeep and chemical costs etc. I'm sure they have a ton of information that would be useful and much more relative than a bunch of us home aquarium types trying to scale up 50+ gallon tank knowledge and trying to apply it to 500,000 gallons.

 

[mrcrazypants05]

http://www.magfloat.net/products/acrylic/1000/ - acrylic or glass from 1½-2"

 

[BillyZ]

I wouldn't want to get my fingers stuck between those...

 

[greenmaji]

I'm sure they have a ton of information that would be useful and much more relative than a bunch of us home aquarium types trying to scale up 50+ gallon tank knowledge and trying to apply it to 500,000 gallons.

ROFL! Yea.. thats a slight posiblilty..