I had a Dolphin Ampmaster on my old tank and it's seals went bad 2 times over the course of two years, the first happening 2 months after I bought it. I hear they are notorious for this. I went with a sequence pump on my new tank and have not had any problems.
I have a Dolphin Ampmaster 3000 on my 210. I am very pleased with it - a hardy pump that runs quiet and cool using less energy than most other pumps. The only downfall on this pump is the seal which was already mentioned. Be SURE it comes with a marine abrasive seal already in place. This will cost a little bit more up front but will save you the headache of eventually replacing it later. This only applies to marine or salt water applications. If it is not the correct seal, it WILL go out - it could be weeks or months. Mine went out after approximately 11 months but I replaced it with the correct seal and have not had a problem since. I recommend it highly!
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