Lighting Subject Underwater in a Tank; Me not Underwater

PHXAZCRAIG wrote:

If you really want clean water, you'll need to add a filter. I have no real idea about filtering a tank of water that large, but I can tell you from experience that nothing - nothing - makes a tank of water look more completely transparent than a good charcoal/activate carbon filter. My biggest tank was only 120 gallons, and a single diatom XL filter canister did wonders. I'm thinking that if you had 2-3 of those set up with activated carbon that they could really clean up a tank well. Just a question of how long it takes/how many filters to use. There must be something a lot bigger designed for the task.

That said, simply having a big 'thing' of activated carbon in the water would filter out impurities even without an impeller pushing water through it. I'm wondering if something might be constructed and then simply kept in a back corner of the tank constantly doing its job. Activated carbon is quite wonderful when it comes to cleaning water. I often thought the water might be more clear than the air I was looking through.

As for microbubbles, I was thinking of those forming on the glass. That was my main reason to suggest a squeegee.

Good suggestion on the wearing black idea. Wonder what the effect would be here if you were shooting through a 2-way mirror?

Yes they have filtering as they use this 1000 gallon tank for professional performances. I’m guessing that you get a lot of churn of bubbles because the people are moving inside the tank and they are moving a lot of water every time they move? The human to water ratio is much larger than a fish to water ratio in a normal aquarium. The first three people in the tank were pretty much crystal clear but then it started to get cloudy. I’ve recommended that next time we do this, we split it over multiple days. I enjoy doing it so I’d really like to figure out the best way to get the best quality images. I wasn’t as happy with my lighting as I could’ve been either. All a learning curve.

i’m not sure about shooting through a two way mirror. What would be your goal with that?