Hello; I started around 1959 and witnessed the same. I started out with air bubbler powered HOB's. Still have a couple of survivors.
For HOBs, I run nothing but Aquaclear 110s with ATI Filter Max IIIs as prefilters. Less risk of sand making its way into the impeller and adds another area for mechanical and biological filtration. They are fairly quiet, especially compared to my 2 sumps.
Can't really argue about the wall proximity and the startup reliability issues.I have no doubt that Aquaclear is the most popular and satisfactory HOBs. My preference is Penguin though because I can place the tank closer to the wall, and restarting Penquin in power surge is more reliable than Whisper or Aquaclear. Just about all my HOBs are Penquin so i can standardize filter pad size. I bought media basket from Marineland and I cut my own from poly batting for pennies.
Direct drive HOBs pumped a lot more water than its media capacity which clogged up qu ickly
I have no doubt that Aquaclear is the most popular and satisfactory HOBs. My preference is Penguin though because I can place the tank closer to the wall, and restarting Penquin in power surge is more reliable than Whisper or Aquaclear. Just about all my HOBs are Penquin so i can standardize filter pad size. I bought media basket from Marineland and I cut my own from poly batting for pennies.
Have you checked the shaft, if it is crooked, sliding a new impeller on it will not balance it.i am using ac110s on all my tanks and two i have are way noiser than the others. i changed the impellers on them and still noises. so i am not sure what it is
I always thought penguin and emperor where basically the same. also what do you use as media in your penguin