Is too much CO2 in a plant only tank bad for the plants?

[Mantis_22]

Same as topic, no fish. Strictly a plant tank. is too much CO
2 bad??

[carpguy]

How much CO2 are you talking about?

This really hasn't been a problem for most folks… getting up to mid 20s ppm seems tricky enough.

[Mantis_22]

How about lets say the maximum I can get... Just the question as is.. Could too much CO2 damage or hurt any of the plants..?

[Mr.Jingles]

no. but the more CO2 you add, the more light you should add. however the consumption of energy from light stops at a certain point, as well as CO2, so cranking them both up wouldnt be very smart.

If its just plants, go for as high as you want. They "breathe" CO2 just like we breathe oxygen. The if there is a ton in the water, they will use what they can.

but be conservative.

[fishhead]

Keep in mind that the higher the CO2 level, the lower the Ph, which can cause other undesired effects. As Mr. Jingles says if you push the limits the plants are not going to use the CO2. So there really is no benefit - if you keep the tank at anything above 30ppm IMHO you are just wasting gas. If you aim for 20ppm, you really will cover most plant's needs. The krib has a lot of good info on CO2 that you might find useful here: http://www.thekrib.com/Plants/CO2/

[djlen]

I've run my newly set up aquarium with plants only up to 80ppm with no negative affects to my plants. I wanted them to get a good start(which they did) so they'd be able to handle the fish load when I put them in.
There is a point of diminishing returns but I don't know exactly what it is. I was happy with the results I got.
Len

[plantbrain]

Over 100ppm.
I don't think you'll get much use above 50ppm.
Regards,
Tom Barr