I have four T5s and two 6 foot VHOs and 3 250 watt halides and they heat my water by about 1 degree.
My Pumps (Sequence Hammerhead, pcx40, pcx50, pcx30, and Blueline 100) heat my water by about 14 degrees! Keep in mind all the above pumps are external, so they heat the water less. Submersible pumps heat the water by quite a bit.
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