If you are willing to stick to crypts that come from only mainland Southeast Asia, you could include the following:
C. affinis
C. albida
C. crispatula var balansae
C. crispatula var tonkinensis
If you just want a crypt collector's tank, some must have crypts would have to be C. beckettii, C. undulata, C. wendtii 'Tropica' and 'Green', C. pontederifolia, C. x willisii.
You could use the C. balansae as the background, C. beckettii, albida, undulata, affinis, and wendtii crypts for the midground, and C. x willisii for the foreground...
Carlos
C. affinis
C. albida
C. crispatula var balansae
C. crispatula var tonkinensis
If you just want a crypt collector's tank, some must have crypts would have to be C. beckettii, C. undulata, C. wendtii 'Tropica' and 'Green', C. pontederifolia, C. x willisii.
You could use the C. balansae as the background, C. beckettii, albida, undulata, affinis, and wendtii crypts for the midground, and C. x willisii for the foreground...
Carlos