Ok i tried again tonight, used regular yeast but 1/2 tsp, 1 1/2 cup sugar (will try 2 next time) i aerated water while mixing, again something i will NOT do next time and see my results. it has been about 2 hours and it seams to start to create CO2, i see that some of you leave your lid off for 2- or so hours, is there any reason? i am gonna cap mine in the morning when i get up & let it run into the gas exchange/counter & vent from there till i get home from work then i will hook it up and watch it.  
Epond83 thanks for that bit about yeast & what it is doing, i was just thinking of working something up so it can aerate @ night but i will let that go with the info ou gave me! 
kjfan1  thanks about the plants, they look much better tonight, tank has settled down a bit. i have soil for my substrate, i really wanted a "low tech" tank but got hooked on excel & flourish, then saw the yeast co2  diffuser for $40 i think & came home & looked & DIY then saw your video & said i gotta try!   Those plants have been in there for 4-5 months, its a 36gallon bow front. about 1.7wpg T5 HO, 31wx2. i dun remember what exact bulbs in there anymore but something like the 10,000 and 6,700 from coralife. (may not be exact bulbs i just listed just what i recall) 
Oh & that is just about 2 liters, i like it cause it is harder plastic that a 2 liter & easier to pour stuff into.  as far as tubes on side not top, i dunno, i was thinking i didn't care for them on top & i would be concerned about breaking a seal on the top not thinking that when i clean it it may be a bigger pain.   ohwell, only time will tell!  I didn't see anything wrong with it & it is always something i can mess with in the future!  Plastic bottles are everywhere, i am sure i will re do it again!  I re did this 2-3x b4 i sealed it up!