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