1500's in a 4 foot tank of SPS is fine, but maybe too much for Softies. 1100's would be more ideal for softies. I have both of these models in my odd-shape tank I like it alot better then the 820's. 1100's are not much bigger then the 820's. The 1500's are noticably larger and heavier. Both new models run as quiet as the 820's. On start-up the new models are alot louder, this is an issue to consider when using on timer. Overall function and appearance of the new models are identical to the previous models.
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