OK, now you are giving us something to work with. How big was your tank? (37 gallon with a 55W AHS fixture? How long was the tank running at 1.4 W before you added CO2? What prompted you to start fertilizing? Were you injecting CO2 at a lower rate than normal or were you just going off of a drop checker?
My point with the CO2 is that if you are running a true low light setup, you probably don't need to have your CO2 at 30 PPM whereas a high light tank does. I might be wrong with this assmption, but it makes logical sense to me.
38 gallon with 55 watts so it is about 1.44wpg. A month before adding CO2, give or take. I started ferts as a supplement since the plants started growing pretty fast, extremely fast for my 1.44wpg tank and I wanted to fill out the tank before algae set in and outcompete. So basically one thing lead to another. I started to bump up the CO2 till the drop checker stayed yellow. You're right about low light not needing 30 ppm, you just have to keep it consistant.
I wasn't trying to attack you, but I did think that your comments requrired some explaining to put them into context. I have read about other individuals injecting CO2 with good results into their low light setups. I had not heard of someone with your type of experience. I find it interesting that your low tech setup was running in an optimal state until you injected CO2. I had not heard of this until your post, and that is why I want(ed) clarification.
Yeah I know you weren't attacking me, never said you did. You were just pointing out my errors, which is normal and actually a very good thing and I'm perfectly fine with it. You are correct in pointing it out to me and I'll never take it negatively.
Well, my point as stated above was that, depending on lighting and type of plants, it's probably not worth injecting CO2. If he needs to add any carbon supplements, excel should do the trick fine enough. Surface aggitation should be enough as it is. Just beware in injecting CO2, you might just end up crossing the line back over to high tech if you don't watch out.
I'm just saying this based on what happen with me.