OK, so just expected melt on the Apon U, that's good to know.
The cabomba's should be getting plenty of both light and co2. The light's about 6-9 inches from the tops of the cabomba's and they're on axis directly under the light. The manufactorer reports 172 PAR at 12 inches on axis. I go have a glass cover between the lights and the plants, so I was assuming the 6-9" would be more comparable to the 12" number. They are also the closest plants to the reactor, so I'd expect them to have the most CO2. Perhaps I'm still low on that. There doesn't seem to be a difference in their health for the taller or shorter ones, or the ones closer to or further from the CO2 reactor.
If I need to go higher light, I'm willing to, but I I'm kinda doubting that's the problem. I am brand new though, so please let me know if the above figures seem wrong. (Of course if I need to go higher light I'm not really sure how... this fixture is very similar to a BML... I can go to two fixtures, but would need to get a different cover -- the versatop I have for the bowfront only really has one fixture width of un-occluded glass (the plastic rear portion would block too much light as would the front hinge.
The cabomba's should be getting plenty of both light and co2. The light's about 6-9 inches from the tops of the cabomba's and they're on axis directly under the light. The manufactorer reports 172 PAR at 12 inches on axis. I go have a glass cover between the lights and the plants, so I was assuming the 6-9" would be more comparable to the 12" number. They are also the closest plants to the reactor, so I'd expect them to have the most CO2. Perhaps I'm still low on that. There doesn't seem to be a difference in their health for the taller or shorter ones, or the ones closer to or further from the CO2 reactor.
If I need to go higher light, I'm willing to, but I I'm kinda doubting that's the problem. I am brand new though, so please let me know if the above figures seem wrong. (Of course if I need to go higher light I'm not really sure how... this fixture is very similar to a BML... I can go to two fixtures, but would need to get a different cover -- the versatop I have for the bowfront only really has one fixture width of un-occluded glass (the plastic rear portion would block too much light as would the front hinge.