laissez faire Banggais!

After reading Chad (CMPenneys) accidental success and Um_fish's similiar experience, and know how Tropicorium breeds their banggais its got me thinking of doing something similar.  I have room for a 48x18x18 tank under one of my FW tanks.
 
Id like to throw around ideas with everyone here.  I am crazy for thinking this may work?
 
Im thinking a 70 gallon tank (48x18x18) with as much live rock as i can pile in there (to be added gradually since i cant afford 200 lbs right off the bat).  Some macro algae in one end with a light over it and starting with a group of 4-6 cards. 
 
The only real problem i see is harvesting them, im pretty sure what ever grows up in that setup would be stuck in that setup unless i removed a great deal of rock to net them out. 
 

you can always set up fake long spine urchins instead of the live rock.

RLTW

180 Gallon Mixed Reef

Then I heard the voice of the Lord saying, "Whom shall I send? And who will go for us?" And I said, "Here am I. Send me!" Isaiah 6:8

I forgot about those, its been awhile
 
I still like the idea of a pile of rock for those tiny critters our fish love to eat, but a pile of those would be nice to throw in as well. 
 
Does anyone know if banggais prey on there young after a certain amount of time?  

That I'm not sure on, but I'll follow along. I know the daddy can gulp them down if he's startled. I would imagine if the fry weren't hiding they would though.

RLTW

180 Gallon Mixed Reef

Then I heard the voice of the Lord saying, "Whom shall I send? And who will go for us?" And I said, "Here am I. Send me!" Isaiah 6:8

I've read that the female will eat the young as they are released from the males mouth, and that the male will join in on the feeding after a short time (hours or day).

Caesra is doing something similar in a 150 gallon tank.  Check out his journal maybe...?