jccaclimber
Member
Once my next tank gets established I would like to add a tridacna clam. I know several people with them in shallow tanks and the common theme seems to be the more light the clam gets the better it looks long term. The sandbed to water level is going to be around 27 inches, with the lights 9-12 inches above that.
For the sake of the exercise, lets assume I want to put a crocea on the sandbed. Sure I could put it up on a rock stack or pick another species, but that isn't the question. I'm trying to put a 12" circle (even better if I could do a rectangle, so maybe 3 overlapping 8" circles) totaling 500-1000 PAR 36" from the source, but focused enough to avoid bleaching everything around it in the tank. This would require a 20° lens, the narrowest I've seen is 40°. Are there any narrower focus lenses out there, or something else that would have the same result?
For the sake of the exercise, lets assume I want to put a crocea on the sandbed. Sure I could put it up on a rock stack or pick another species, but that isn't the question. I'm trying to put a 12" circle (even better if I could do a rectangle, so maybe 3 overlapping 8" circles) totaling 500-1000 PAR 36" from the source, but focused enough to avoid bleaching everything around it in the tank. This would require a 20° lens, the narrowest I've seen is 40°. Are there any narrower focus lenses out there, or something else that would have the same result?
