Whats next? 3 weeks old tank ...

[Reefcan]

I really appreciated your advices, learnd a lot from you guys.
Moldrik: Its seems your tank has been running for 2 months, and you've not add any coral? So how long do you think we have to wait? How can we tell the tank is stable?
Myka: I tested phosphate(0), nitrate(0), PH(7.8-8.0), KH, calcium weekly, shows nothing wrong there. Is my test kit not accurate enough? Its a "Reef Master Test Kit" from API.
When I went to the LFS, they tested water for me (2 weeks later when tank was build by the guy who sold me the system), and told me to pick up some fish and coral, said it would be OK. I bought couple gobies and snails. After another week, I went back the LFS for the algae problem, they sold me a sea hare and 2 urchins, eventhough I don't like them, they looks sososo ugly! but the guy said they will take care of the algae. I'm not blaming them, but don't feel right.
The sea hare died lastnight......