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Yes, parva is probably the smallest crypt but I just want to know which is the smallest from that list of five. I've done plenty of searches and get different information everywhere - typical internet!!!
I think the problem is that they'll grow differently depending on the conditions in the tank... they'll even grow differently on different sides of the same tank...
It depends on the richness of the substrate but IME lutea is small. I have it growing in 4 different tanks, with the leaves averaging around 3-3.5 inches. Although some are staying smaller, and others are extending close to 5 inches.