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4. You don't have to buy the most expensive equipment. You need to buy reliable equipment that is readily available.
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9. Coming back to reliable equipment, we all know that if it's made for a niche market you pay a premium. Do a little research and you can find equipment that works just fine for aquarium use that is made for another bigger market.
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If I had a separate fish room where I could have placed my sump and all the other associated pumps, skimmers etc, I agree with the above 100%. The best choice would be reliable and readily available as well as using equipment normally used outside the reef tank market to avoid paying that premium. Keep in mind that reliable and readily available does not always mean efficient so do your research and don't choose cheap just because its cheap.
My sump and related equipment is located under the DT which sits in the living/dining area of my house. So I had an additional non-negotiable criteria: silent running.
So either I didn't look hard enough or it was just not available around here, but anything that was reliable, not expensive and/or normally used outside the reef tank market was louder than I (or my wife) was willing to put up with and would have eventually ruined the whole experience.
As part of my planning, I visited quite a few large reef tank installations. The lucky ones that had a separate fish room and were using the reliable, easily replaceable equipment were happy with the equipment choices they had made. And they were happy for not paying that premium. But the fish rooms sounded like the engine room on a ship. Then again, it didn't matter because you couldn't hear it unless you were in the fish room.
The ones like me who had to have the equipment under the DT and also tried to use reliable, easily replaceable stuff just ended up having that engine room noise moved to where the DT was.
So yes, I did pay a premium for that additional criteria but I'm glad I did. The DT and all related pumps and equipment give me a background noise level in the living/dining room when next to the tank of between 30 and 35dB. Basically a low hum (the decibel app on my phone calls it a "quiet whisper" ;Happy) . Wife and I are happy!
The only noise issue concerns the exhaust fan that pulls air from above the tank to outside through the wall. The speed of the fan is managed by an air temp/humidity sensor through my Profilux. Up to about 80% speed the fan is basically inaudible. But from 80 to 100% fan speed it starts sounding like a jet engine. But it rarely gets above 80% speed and I'm working on finding a fix that would avoid those speeds altogether...
Sorry for the longish post but some of the reefers I visited who had that reliable easily replaceable equipment under their DT would have liked to seen a post like this before making their decisions on equipment.