t5 will give off less heat for sure, the hqi 150w will be sufficient even a 70w however it may get warm in the summer also if you want more colour out of the hqi go with 20k. If it was my choice I would go with a hqi for a small tank, if your tank was wider like 3ft then t5
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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