I have some lance leaf sundews and a n.biacarlata a n.rafflesiana and a n.ampullaria growing in my tank and want to know what else would grow well in it?
So I assume it's a hot, wet lowland tank...what about any of the tropical Australian petiolaris complex sundews (lanata, paradoxa, etc)?
D. adelae (lance leaf sundew) grows along-side D. schizandra and D. prolifera, so they should work well as companions.
Some Mexican butterworts might work as well, but be careful: some of them require (or very much prefer) a dry dormancy period.
I list these because they are truly living as companion plants in my ytopical setup.
Lycodium might be nice. I really like the temperate North American varieties that grow as companions to sarracenia in the wild.
There are several Southeast Asian forms. They are offered on eBay sometimes.