Feeding in refugium?

[match55]

my DT is so clean now,nitrate finally stay at 10ppm in the DT but my refugium started to have the diatom problem LOL. anyway

I didn't feed in the refu, and wonder if I should, since there r some peppers, snails and crabs down there. I also have chaeto and pods.
they seem doing ok, I always see the crabs picking up stuff on my chaeto and I totally not worrying about the shrimps cuz they probably will eat my nass snails >.>

so do you guys feed your refugium as well??