"Kelly" wrote in message
news:a8jTc.99264$J06.51282@pd7tw2no...
I recently upgraded from a 65 watt power pc to a 400 watt metal halide. I
noticed today that there are bubble sitting on top of my DSB (1 year old)
and a fair number of bubbles mixed in the sand and crushed coral that I can
see through the glass. Is the new lighting a coincidence or am I killing
something good or bad?

Kelly

Your sand bed is just releasing gas. This is fine.

CapFusion,...