Just got 2 d120 over my 90 looks completely different... I had 8 t5s above it how low should I start the LEDs in the beginning had them at 20-30% today and how fast should I acclimate it up... Now what to do with my 48" t5 fixtures should I keep one on there or is the LEDs enough
Leave the brace its there for a reason. It supports the strain on glass in the middle where it bows from all the water. If it were me I would keep the light for a few months to see if your corals do well. If it works for you at that time then sell if not you have a trusted light to fall back on. =) Looks good though.