If you wanted to do only two pumps and have even flow for anything you could ever want to keep I would go with 2 6105s. If even flow is not a concern could save a little money and do 1 6105 and 1 6055. Or you may be able to simply do 2 6055s and be happy as well and if you desired more flow supplement with a 3rd pump. The 6055s are good really for about 3 feet of flow.
If you stick with zoos, LPS and softies, a couple 6055's would be fine. For anything more than a couple basic SPS, the 6105's would be a better choice. You would run them at the 15V setting so the flow would be about 2000gph max.
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