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I think that refers to the minimum necessary, more won't be a problem, - in low-tech or high.

Didiplis diandra was popular in the days when all tanks were low-tech. :)

There are European and North American Frogbits as well as Amazon Frogbit. :)

I'm sure you'll get lots of help if you give us some information to work with.

From one of my dad's old books, Tropical Aquariums, Plants and Fishes by A Lawrence Wells, 1937;

Increasing it is only good if it was previously insufficient and causing problems, and the same goes for surface agitation. :)

As the Frogbit looks so good, and with the tank being 60cm tall, I suspect the light may not be bright enough for the other plants to flourish. If you could find any more info on the light it might help, but most manufacturers and suppliers are not good at giving useful information about their...

Vallis is one of the plants known to be sensitive to glutaraldehyde, you would risk killing it all off. Some people have got away with it, but without knowing how.

Nicely put, AWB. :)

I used to grow it as a greenhouse bog plant too. That was years ago, before I ever heard of anyone growing it submerged. I don't think it naturally grows submerged for long periods, and I guess that's why it needs CO2, not having access to the atmosphere. I wonder if it needs nitrogen when...