Originally Posted by fish_4_all
Use an airstone to diffuse the CO2 into the intake of the powerhead or the canister filter. An inline reactor will work a lot better but I have never used one so I am not the best to give advcie on them short of they will work about the best of any option to diffuse CO2.
Reaction chambers are the best but they are large- so for aesthetic reason pollinating reactors are becoming more popular.
There are a number of factors that are innvolved in reducing the ph level of an aquarium. Adding CO2 will reduce the ph yes, but its effect is determined by the hardness of the water measured in kH and gH. 5 is quite high for a planted aquarium you want to be at 3-4kH.
I suspect the reason why you are not experiencing a difference in performance because of the poor method of diffusing. You want a reactor with a media inside that will break the CO2 bubbles up- this will then aid the mixing process, it needs to absorbed by the water. A reaction chamber has 2 inlets, one for CO2 one for water taken from the outlet of your filter, the outflow mixes with the CO2 and so water mixed with high concerntrations of CO2 are added to the aquarium.
Unfortunately the reactor i speak of has been discontinued from seras product line- it has been replaced by this http://www.quantumfish.co.uk/listman...ngs/l0139.html
which is no where near as good.
As for the green algae on your plants, that is happening for 2 reasons, your water is not clean enough, and this means you are not providing a suitable environment for you plants, and you are not feeding your plants- i would guess that your water is pretty flat- the pours are not open on your plants which causes this green algae, you need mineral salt in the aquarium- there are freshwater salts available on the market, add one teaspoon per 5 gallon when you carry out a water change.
Well thats my advice, hope it all works out- but you need to sort out the reactor, 1 per second is more than adequate. also turn your gas off at night- but you knew to do that anyway right? :)