Originally posted by rdracer66
Here is my co2 setup
this past sunday i made a bactch of my first diy co2
i put 2cups sugar and 1 flieshmans packet and filled with luke warm water and then shaked
hooked up the line and then fed it into the tank with a airstone on the end, and its clogged twice so far
it puts out jjust tiny stream of tiny bubbles
and now it's every few seconds it puts out a bunch
in the beginning it was a steady flow, my problem now is that i see the bubbles at the top just sitting there
this is a 29g and i have a penguin 170 and a cheapo walmart filter about 20g one in there
so im dumbfounded as to why the little bubbles are just lying up top ??
any ideas ?
I want to just use a air stone if possible
1 because im just not that mechanicaly inclined 2 i dont want a ph crash
my ph out of the tap is 7.6 and gh and kh at 1 !!
i just checked the ph tonite and i'd say its around 7.0-7.2 so it must be working a tad, my plants do seem to perk up just a little lately and i increased the light to 10hrs from 7 I'll try to get a pic up tomorrow. as far as the bulbs go I think the 2nd cheaper one woudl be better to due to cost but i just checked that page again bulbs.com and the expensive one they sell one at a time the cheaper one is a case at a time, wonder if i can get them to change there rules ? or find it somewhere else maybe ? on a side note to the co2 setup i have shouldnt it be coming out the entire air stone not just a tiny tiny spot on the bottom ? maybe i have a leak ? i didnt glue the line going thru the cap, i made a really small hole enough for the tip go thru and used a pair of pliers to pull it thru and it was not easy to say the least so im preety sure its' air tight
As for your CO2/pH situation, a few things...
1) Your water is fairly soft. Injecting CO2 can easily cause some pretty dramatic pH swings. You should think about adding a buffer of some sort. A tsp of baking soda should raise your KH enough to keep major pH swings out of the way. Fish don't like change - and I would even raise the hardness slowly. Maybe 1/4 tsp per hour and test KH in between additions.
2) Don't assume that line is airtight in the tight hole you drilled in the cap. It is most likely leaking considerably and that's why you're only seeing a small stream, and only occasionally. Use some silicone or epoxy to make that sucker airtight.
It's not unusual that the airstone is only delivering bubbles from a small area of the stone. There isn't a lot of pressure coming from the line, especially since you might have leakage around the tube/cap connection. The air needs to push quite a few inches of water before it can escape the airstone, while the cap is just open to atmosphere.
Also, the bubbles are just floating on the surface because your water is soft. They aren't doing much good by just rising to the surface and popping. Try putting the airstone underneath one of those filters and letting the filter break the bubbles up into tiny bubbles that can be absorbed into the water column far more efficiently.
With a KH of just 1 degree, it's going to be tough to get appreciable CO2 levels without causing major pH dips. At a pH of 7.6, your incidentary CO2 levels were less than 1ppm! Even at a pH of 7.0, they are only 3-4ppm. Raise that KH to 2-3 degrees and shoot for a pH of 6.8-7.0 and your plants will be seeing the levels of CO2 that they need to really grow.