I believe the most over looked aspect of plant keeping is the need to continuously trim. This is something that these sort of tanks have masses of. I wouldn't be surprised if they were trimmed daily. We spend so much time talking about co2 and flow that when we do get good growth we are reluctant to cut it out. The more you trim the healthier the plants.
Certainly with bolbitus trimming one or two leaves twice a week keeps the more compact form, if left the leaves get quite long and leggy forcing new growth to gain length as quickly as possible to get some light.
Pinna is a different beast though, I've tried all sorts and it never forms the bushy look of his??
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