Oh, as far as pumps go, I recommend two smaller ones instead of one larger one. In case one fails, you will still have half of your flow. Even at that point, you could turn the second one up if it's a DC style that has an adjustable controller.
With heaters, I think it's best to get by with as small of a heater as you can. This way, if something ever happens to keep them stuck on, you will have time to notice before they overheat the tank. I just had this happen last night/today. My heater controller probe had been pulled up out of the water, but not out of the tank. It stayed reading about 78*, which kept my low temperature alarm from going off. My water ended up at 84* instead of its normal 82* before I noticed it during water change today. Oh, and along the topic of heaters, make sure to use a controller for thermostat redundancy. I use an InkBird 308 on all three of my tanks. I really like it but the favorite here is the Ranco. I think both are good.
With heaters, I think it's best to get by with as small of a heater as you can. This way, if something ever happens to keep them stuck on, you will have time to notice before they overheat the tank. I just had this happen last night/today. My heater controller probe had been pulled up out of the water, but not out of the tank. It stayed reading about 78*, which kept my low temperature alarm from going off. My water ended up at 84* instead of its normal 82* before I noticed it during water change today. Oh, and along the topic of heaters, make sure to use a controller for thermostat redundancy. I use an InkBird 308 on all three of my tanks. I really like it but the favorite here is the Ranco. I think both are good.