If I'm not mistaken, the Moby Dick 25 is 25 liters? Unfortunately, that would be too small for angelfish - at adulthood, they'll need a tank at least 18 inches (45 cm) tall. The rainbow sharks will also outgrow the tank, and at maturity, they'll become very intolerant of other members of their species, as they claim a very large territory. They're best kept one to a tank.
Considering that only two days ago, you were just assembling your filter, you also really need to get on top of your water testing and review this thread. I'm pretty sure I linked this in one of your threads asking general tank setup questions, but you must have missed it, considering the sensitive nature of the fish you added so soon.