I used to purchase from Saltwaterfish.com but had a problem and have since stopped.
They have a "free ship" site, so I often ordered stuff from there or ordered enough to get free shipping. I had one animal arrive DOA, so I contacted them online and they issued a credit. The problem here is that the credit was only for $12. When I went to use it, the system wouldn't let me because I was using free shipping. I called them, and was told that I had to order something and pay for shipping (around $35) in order to use my $12 credit. I asked to speak with a manager, and left a message, but never received a response back.
Horrible customer service.