10-10-2007, 03:19 PM
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Well, there are advantages and disadvantages to them both. Let me go through the things that jumped out at me, hope it helps!
The first one sounds like a tank that is possibly overloaded with fish, which means a few things: There may be losses and problems with stress and/or illness to deal with, and sorting out the "mess" someone else created can sometimes prove expensive and time consuming. On the other hand, this tank sounds better established, and has the benefit of having liverock already cured and full of life. You are also looking at 25 gallons difference in size, so if space is an issue... or lighting, with the 150 being a deeper tank than the 125.
The 2nd tank sounds like a good enough deal, added benefit of a sump system for filtration... and the bigger of the 2 tanks, but will need live rock, which, in a tank of that size, can get very expensive. Having standard lights means if you wish to do a reef tank, you will also have that expense to provide proper lighting for it, and being a deeper tank, it will require more light.
Put the 2 together and you'd have a good thing, lol! If it were mine to choose from, knowing I'm prepared for the mess, I'd take the 125 and clean up/fix what it needed. If fish are healthy, a lot of LFS's will take them, some will offer store credit for them. Knowing you have a good group of people here to help you sort it out if you are diligent in doing so, meaning lots of back and forth with us to get it moved and healthy as soon as possible with the least amount of expense. I will also say, if taking a tank with reef animals in it, be prepared to have a quarantine tank set up at the time the fish come to you. You will likely be needing it almost from the start. Also, weigh the expense of the skimmer vs the UV sterilizer, as each has one, but neither has both, and if you want to persue reef, I would suggest both.
I hope this has given some help to your decision. Let us know if you need help in moving fish or getting prepared for the saltwater life... it's a rollercoaster ride, fun and scary all at the same time. Welcome to our common addiction!