Plants and Airstones

I read the following last night:

"...where freshwater tanks are in question, experience and years of research have shown that this system (being the supply of oxygen via aerator) presents certain problems, the most serious of which is the expulsion of carbon dioxide essential for the photosynthesis of plants. For this reason, porous pebbles are no longer used in freshwater aquariums in which aquarists wish to cultivate plants"

Does this mean that it's actually harmful to my plants and that I should remove it or can I still use it for effect?

Will my fish get enough oxygen without it?

I have a 150 l/h filter running on my planted 30 liter along with an airstone and UGF. On the 100 liter I will be running a 800 l/h filter. (Not sure if this actually has anything to do with the whole aeration process)

:wondering:

 

Well plants also create oxygen but usually not enough,airstones don't add oxygen directly to the tank.When the bubbles hit the surface they disrupt the surface tension and CO2 and oxygen exchange places with eachother.I think this can also work the other way around because the outside air is full of Co2 and oxygen (how else would plants outside grow ).

I'm not 100% sure but if there is too much oxygen in the tank then some of it will probably be replaced with the Co2 outside the tank (only a theory so don't take my word for it)

If you really want cheap Co2 then you can research Fermentation,not ideal for fully planted tanks i think.

 

Okay, let me have a go at this:

There are no harm in aerating a planted aquarium. In fact I aerate all my aquariums when its lights off time. When lights go off the plants don't take up anymore CO2, so you will have excess of CO2 in the aquarium. Hence most of the members I know on another local forum aerate their highly planted tanks when the lights go off and an hour before their lights goes off the CO2 shuts down.

This is to prevent the fish from being gassed and suffocating without sufficient O2. Also an added advantage of aerating water is evaporation, meaning all the chemicals we add to our planted tanks, any unused fertz ect will evaporate eventually or be removed by our weekly 50% WC.

As for the CO2 part of this, plants only take up CO2 under light or sunlight. So as stated above no light, no CO2 being taken up by the plants and aeration being needed for the fish.