read through the link in my signature on understanding the nitrogen cycle. that should explain whats going on. basically when you rinsed everything in tap water, you killed off the bacteria that makes the tank cycled. you'll have to go through a cycle, and a liquid ammonia and nitrite test kit will help you big time. the best kit to get, imo, is the API Master FW Test kit, its anywhere from $20-30, cheaper online usually, and will let you test ammonia, nitrite, nitrate, ph.. BTW, dont use anything like algae control, it can foul up your water. Just dont run your lights too much and dont overfeed and you shouldnt have any algae issues