> From: bowkerg at NTU_EDU.AU (Gail Bowker)
> Date: Thu, 20 Jun 1996 10:16:11 +0930
> >One way to tell if this is photosynthesis or just trapped gas escaping
> >is to change water with the lights off. No light, no photosynthesis!
> But, how could you see the bubbles if the lights were out?
It doesn't need to be very dark to stop photosynthesis. Ambient room
lighting will not support [much, if any] photosynthesis unless, of
course, your ambient room is outdoors.
At the worst, you could sneak up on the tank and snap the lights on
for a few seconds to check for bubbles. Or, HEY!, use a flashlight.
Yeah, that's the ticket.