One thing to keep in mind is that a cryptic fuge is designed in a way that only sponges that prefer low flow and low light conditions will thrive there. The several species that grow successfully in that environment do so because they are specifically adapted to it- any high light/flow sponges thay may have been on the rockwork would have died long before you knew they were in there, leaving the low/low varieties behind to grow. Youve been successful with sponges, but only with a limited variety of them. You cant generalize and say that all sponges will do well in that kind of set up simply because those particular species did; that would imply that all species are adapted to require the same environment.
According to Mr Calfo on the topic of blue sponges in general~
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They are unique among Poriferans in that they like very high light, very (!) strong water movement and they are both calcareous and heavily photosynthetic. Basically, treat them like an sps coral. The big catch is that they cannot be exposed to air for long or at all. Bag them completely underwater and release them underwater...Little or no phyto[plankton] needed. They are symbiotic with BGA.
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