Yes crypts really are great. My experience is that many seem to develop a lot of root relative to leaves. Perhaps this is why many readily "melt" with changes in conditions, such as aquarium water chemistry. They might find it advantageous to just draw nutrients back into their extensive root systems with environmental changes, then sprout again when conditions have settled.
Crypts have great flowers too. This one might be the flashiest of all,
Cryptocoryne ciliats.
Another great feature is that, with a few tricks, crypts are easy, low-maintenance plants for growing both above and below water.
