Sponges

[Europhyllia]

Hi Mike,
way late on this post but I thought it was an interesting topic.
The blue sponges available are usually Haliclona, a photosynthetic sponge that requires good lighting (Ed is getting me one. )
The one that seems to do best in my system is a orange ridge sponge.
I have a beautiful spider sponge frag from Ace that so far also is looking great.
I had ordered an orange tree sponge but received a red tree instead and it really isn't looking too well despite good flow, phyto, and other filter feeder foods.
I've seen some aquacultured orange frillies which might be a good choice