I have grown B heteroclita for a while know an it is a prolific grower, just not submersed. It is a marginal plant and not really even a reophyte like a lot of other aquatic ferns are. It will handle being submersed for short periods but not for long periods. In high humidity terrariums or emersed setups it grows like crazy which is probably why Petco sells it in the tubes (for those that didn't know very few aquarium plants seen at pet stores are grown submersed most are emersed grown).
Len
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