I'm using the packets at the moment. The first lot failed to produce any bubbles after 24 hours so I threw that away and mixed a new lot but slightly increased the water temperature and cut down the length of tubing by about half. This time it seems to be working well and is producing 2 or 3 bubbles every 5 minutes.
When the packets are finished I'll start mixing my own, from what I've read it seems more effective and a lot cheaper than buying the packets!
WPG is just over 2. 40 watts of lighting, one Aquaglow and one Powerglow and water volume once displacement from gravel, bogwood etc is taken into account is probably about 38 uk gallons.
Yes, the red one is a myriophylum. Most of the plants were ordered online and came as a selection but they weren't labelled so I'm not sure what some of them are. I'll just have to wait and see how they grow and then change things if necessary.
Thank you for your answers. 2-3 bubbles every five minutes is not so good. Try 1 bubble per 3-4 seconds or even a bubble a second! That's what I have to do to get 30ppm of CO2 to fend off algae and give my plants a head start. I got your bubble rate when I used the packets. The yeast in them tends to be very old and ineffective. When you do decide to get your own yeast, follow this recipe. It's from Jimbooo over at the planted section and it has helped me finally achieve 30ppm.
1/2 tsp of yeast
1/2 cup of sugar
1 tsp of bicarbonate (I don't use it, my tapwater is moderately hard, so I have enough buffering to stabilize the reaction).
Dissolve 1/2 tsp of yeast into 1/2 cup of luke warm water and stir until dissolved. Pour 1/2 cup of sugar into canister. Then pour water/yeast mixture into canister. Then fill with lukewarm water until about 2 cm below the final notch, and stir well. You should have bubbles in a matter of minutes and at quite a clip too. That mixture lasts about a week, but I have to supplement with Flourish exel by the end of the week because it's rather cold in my apartment and the reaction is not quite as fast.
I have myriophylum as well, the green variety in my tank, which has 3.7 WPG. From what I've read, the red variety demands bright light, but there are so many conflicting opinions and so many different varieties that look the same but have different requirements, that you may be fine with the lighting you have.
Keep us posted with your tank. It really does look great so far.