I am in no way saying don’t buy from them. Just don’t take their word on things as gospel. Double check everything for yourself first. Take time to learn about fish before you buy them. Make sure that it isn’t going to decimate your corals or kill the other fish in your tank before you buy it.
You have a good opportunity here. Since your tank is not cycled you can be patient and take that time to learn a lot before you ever start to add any livestock. Read up and understand the cycle process. Read tons of threads on this site and don’t be afraid to challenge what someone says in a thread. There are lots of knowledgeable people and lots of “Know It All’s”. There is a big difference. LOL I don’t trust anyones advice if they can’t tell me why. Good example is with topping off your tank. Some say, you MUST top off with freshwater and you MUST use saltwater for water changes. While that entire statement is not wrong, the MUST part is. The key is to understand that you want to maintain a constant salinity. Therefore, if the water you loose is due to evaporation, the salt stays behind and freshwater is the best thing for top off. However, if you have a glass top like me, the water you loose is from taking samples or drip acclimation. In that case, you are taking the salt out with the water. The better way to explain how to top off in my opinion would be to say, test your water, if the salinity is high, use fresh water to try to lower it to the desired level. If the salinity is right where you want it, use saltwater that has the same salinity when you top off, that way the overall salinity stays the same.
The main thing is you have some time while your tank cycles. Use it wisely and learn all you can. Ask lots of questions. You will be glad you did. Also, make your first purchase a RO
unit and mix your own saltwater. Purewaterclub.com makes a good inexpensive one. You can get the 100 gallon a day for around $60.00 from EBay or from their website. I bought this one PureWaterClub.com
which is the same as the one I mentioned but does 150 gallons a day.