I had some after about 3-6 months.
The feeding thing is that you don't have to, but I saw decline in mine when I didn't - maybe a correlation, maybe a tank issue.
I am planning on making sure I get some food for the filter feeders in the tank, I have been reading about how some critters like filter feeders only eat specific size particles of foods (Electric Flame Scallops specifically).
This was in response from the trying to get certain live pods
for my little tank and most stores only having Tigger Pods
(if any at all). Nems kinda grab what they can get. Not really a filter feeder but similar foods. I also recently read that the RFA will take in pods
to eat. Don't really know yet.
The one huge, really frilly white pink one I used to have seemed like it was filtering to get things with all it's fringe.
I had some with the live rock and sand from several months on.
Also Dallas, check the Petco off Colorado & I25 each week. A few months ago they had some. $14.99