Mine is different but gets much more restrictive with a sponge on the intake side which can clog up. Have my CO2 diffuser directly under it. Placed about half way down the back of the tank blowing forward. But don't mind me. :smile2:
You can trim the blade down but it's kind of permanent.
I've never done it. I've just read about someone on the forum doing it. If you spin it you'll get it even. Seems like you could use some sandpaper. Be careful, I'm sure it can hurt you!
Absolutely tons of great info here. Thank you so much you have very good knowledge on all of this stuff and I always enjoy reading your very knowledgeable posts so thank you for helping a newbie like me going through am sure the same pains you may have at the beginning. I am going to take a read at your ph pen post. That is a very good idea I may switch the in/out pieces so I can get the out to much lower like you stated. It makes sense because by the time it does hit higher in the tank it would of spread a much larger radius compared to coming out nearer to the top. Man your knowledge is great and like I said helps someone like me. So thank youHard to say what might work best in each tank without seeing how things drift and flow around. One point that I'm hung in the middle of is how much effect it has when I put CO2 in near the top versus nearer the bottom. The point being that we want to get CO2 to all the plants and we also want to lose as little out the top as possible/practical.
So I have a 125 and moving the outlet of the CO2 down by adding a tube on the filter output so that the CO2 came out near the tank bottom seems to jump start some of my plants. Sometimes it is easy to misread things like that and think it is one thing when the true cause comes from something else you've done.
At nearly the same time, I was looking for a better way to read CO2 content of the water and came around to the small/cheap PH pens. So I got the pen, modded it so that I could read the PH in all parts of the tank and went through a 20 long to test how the CO2 was in all parts. In the twenty long, which is a relatively low flat tank, the readings were very uniform except for one space near the top. In that tank, I found no reason to worry about where the CO2 was added but it left me still wondering about larger tanks.
At this point, I've still not got my life back together so that I can do a study on bigger tanks. Too much life going on right now?
Meantimes, it is my "guess" that adding the CO2 as low in the tank might/could/should help to keep it from going up and out? Best guess but not real testing to see until I can get back to that project.