Join Date: Jan 2004
Location: Formerly Central Coast CA, Now in Bridgeport TX
At 2wpg i dont know how vital the CO2 will be, but if your looking to add low quantity of CO2 run DIY with yeast and sugar. do a search for DIY CO2 on this forum. basically your putting water sugar and yeast into a bottle with an airline that goes to your tank, prefferably into a filter intake tube, so it gets diffused by a filter impellar. should only cost you like $10. I know im speaking US currency but from my understanding things that cost us 10 US dollars cost you about 10 AUS dollars. as far as ferts, pehaps you have too many for a medium light tank? could be that the addition of the riccia and the green water are coincidence, and the green water is actually a bloom caused by excess nutrients available via ferts? I have never used the other products you are referring to, but i have used flourish both in the tabs, and as a liquid fert. I have found the CO2 drop in tablets to work fine for smaller tanks but as tank size increase, and number of plants increases, they stop being enough.
As for Pressurized CO2, the internet is local to everyone. Jack Wattley has a pretty good price on a regulator with bubble counter and needle valve at wattleydiscus.com under products. get your CO2 bottle from a local welding supply shop. also soda machine suppliers carry CO2. I recommend either a 5 or 10 lb bottle. the way it works here, you buy a bottle with a fill, then when your out, you take it in and trade it for a new full bottle for the price of a fill. the bottle are always pretty beat up looking, but they work fine. No need to buy the ultra expensive shiny stainless steel versions they sell.
Planted tanks are all about shrimp.