[fedge]

well to answer back to Rolo....

I got a 5 gallon tank that really greens out better with co2..even though it aint much (about 3b/min)... it did help out with growth rates. This tank is a 10 gallon with about 20 watts of pc light.. it really needs the co2...I get good growth from everything (even the ludwigia repens is REDISH--a sign that the light is high enough).

HOWEVER>..... Today I hit the Eureka!!!!

Spinning off the idea from Rikko... I took some of my fiberglass epoxy coated screen material(i use it for filter bags)...and doubled it up (three layers may be better..just make sure that they are offset 45deg from each-other) and rubber banded it to the bottom of a spice container I had lying around. I cut the bottom off and weighed it down with plant weights (temp.). I then took the hose out of the crappy pop bottle difuser I got in the 29gallon and hooked it up to this little thing...(hard to do underwater). It dumped a large bubble of co2 under the mesh.. and about all the hosing under the water then backfilled (you know when the pressure is not enough to push the water out of th hose...if that makes sense). This bubble disolved in about 3 mins... or less. Then more bubbles came. It did burp once or twice.. but I am thinking that is becuase the unit is not level.. if the screen was level and about 3 in diameter instead of 1.5 it would do better. After watching the thing do ITS thing for about 30 minutes, I decided that this may be the way to go. I have no idea though if the acidity of the co2/h20 mix is going to eat up the epoxy.. or what have you. This is something that only time will tell. I would imagine that over time this device may get ineffecient..but having a larger surface area will allow you to NOT have to survice it a lot over time (maybe once every 6 months--allways cool not to service something ALL the time). Thanks for all the suggestions... I think I found my new toy....