yeah, my tank is too knew, and the CO2 levels were too high yesterday, one of the neons came to surface for oxygen poor little guy. I had to pump oxygen into the tank now i think his recovering within the plants. Man i wish it the plants would hurry up and grow. I've got heaps of 2 species of plants, 1 grass species and 1 moss species. The tanks is planted out not much more room for any other plants. I also made that CO2 system with the bottle, it worked but it didnt look very nice, big airstone and all. I've got this kit with a stair type diffuser it works and looks pretty good, so i am happy no big deal. Got some plant supplement as well so i hope they grow fast.