T5 High Output? If yes, then the lighting is fine. I would start the frags on the bottom in low flow, partially shaded. You can move them up after a while. Blastos don't like lots of light or flow, so keep them partially shaded permanently.
If they are regular T5s then the lighting is still fine. Acans and blastos are NOT high light corals. Blastos will bleach out in direct bright light, so keep them shaded. They are very hardy, so you should be golden!
You can feed daily, weekly or never. They should be ok with anything, but do benefit from occasional feedings if your aquairum can handle the excess nutrients.
Post a picture for fun!