Co2 Bubbles Behaving Oddly

[qwikimpss]

Ok, this is kinda weird. I am acclimating 7 new Rummy-Nose tetras into my 29 gal tank that my girlfriend surprised me with (so nice of her) and I added a little Melafix to my tank, it says to on the directions to add some for the 1st 3 days after you get some new fish....anyway, back on topic. After adding the Melafix the CO2 bubbles on my ladder are no longer merging together like they did before, now the just bump into eachother (I'm not complaining because it appears that I'm getting some really good diffusion as the bubbles are diffusing all the way into the water).

Has anyone ever experienced this? Seems kinda weird to me.....and also very cool!