hi everyone, i was just hoping to get some suggestions as to a good return pump(preferably submersible) for a 90 gallon tank which is going to be mostly sps. thanks for your help.
Go with a eheim 1262 or even 1260. You don't want that much turnover in your sump. But for SPS, get some good powerheads. I'd go with the 1260 on yours.
I would recommend the Eheim 1260, 1262 or the Tunze Master Recirculation Pump 1073.030. They can be run internal or externally. Dead silent and some of the most reliable pumps on the market. Rio Hyperflows (not the regular Rio's) and Quietones will also make good choices. The Mag is reliable but they are not as quiet as the others. I run a Mag 36 on my skimmer and I think all the concern about temp increase is pretty crazy. They do add heat to the tank but not that much. I think I saw about .3 degree increase in tank temps after adding the Mag.
If you can, I would recommend an external pump because they have less heat transfer. However, they can be nosier and use more power, but most last years with little maintenance.
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