blastos are very sensitive to lighting. i would put him in a more shaded area that allows more blue lighting in & medium flow where it gently hits the coral, its at a delicate stage. too much flow will press its flesh onto its skeleton & stress it even more, running a risk of tearing flesh. when you feed frozen, thaw the food in some tank water & with a turkey baster, gently blow some of the water from the food on top of the blasto, to stimulate it. hope it helps. good luck & happy reefing.