Hi Amanda
In my 95l low tech I have straight vallis, crypt wendtii brown, crypt wendtii green, crypt wendtii Mia Oya, Hygrophila corymbosa 'compact', Java fern, Amazon swords, Echinodorus bleheri, Echinodorus ozelot and Echinodorus 'rose'.
The only thing I have noticed is that when the Echinodorus 'rose' sprouts new leaves they are nice and red but as they get bigger they tend to darken and then turn green. I would hazard a guess that this is down to the low lighting (1wpg), but hey, no dramas, all the plants are in healthy condition.
So as you can see from my post and all the others above, there are plenty of plants for you to choose from.
Ajm200 said:
Always thought crypts, anubias and swords were ok but since joining this forum have seen instances were lack of co2 has been blamed for issues with these plants
I wouldn't mind betting that it was fluctuating CO2 that has caused the problems you have read about, and not low CO2. That causes more problems than anything else in this hobby.
So as you can see from this thread, you can grow a whole range of plants without injected CO2. There are only a few exceptions to this rule, but your usual run of the mill aquatic shops don't tend to stock these as they concentrate on the fish.
So next time your in your local aquatic store, just buy the plants you like the look of. Most, if not all, will adapt to the low CO2 conditions.
Hope that helps.