Let the ammonia drop to an undetectable level, or at least below 0.15 mg/l, before adding fish. 0.5 mg/l is marginal. The nitrite can be safely ignored. I suggest leaving the shrimp in there for a few more days and then discarding whatever is left over. I know it's hard to be patient at this stage, but in aquaria nothing good happens fast.
I have never used T5 so can't give you a specific recommendation. I prefer Kessil LED pendants because they use less power than T5 and I like the intensity & color controls and the glitter lines. However I believe T5 is at least as good for coral health as LED.
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Stuart
Current Tank Info: 300G Caribbean biotype reef set up in 2003.
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