03-29-2014, 09:48 PM
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Do you know what sort of Crypts you got? It's very difficult to just say Crypts are a foreground or background plant without knowing a bit more. First there's a difference in size between species (for example: C. beckettii petchii gets between 4-6" as does C. undulata, C. x willisii 'lucens' gets 4-8") and varieties (C. wendtii 'green gecko' gets 4-6" while on the opposite end of the spectrum is C. wendtii 'red' that can reach 18"). Even beyond the type things like nutrients and light play a role. In high light you can expect some Crypts to grow lower, while in moderate and low light they will grow taller in an effort to be closer to the light.
If you're not sure what kind you have, I'd try to find out from whoever you got them from. Perhaps the biggest drawback with dirted tanks is the inability to move plants with large root systems without pulling a lot of soil above the cap. The only other option being cut the roots and possibly kill the plant.