Unfortunately I too have to agree. The care for a hippo in this tank is not suitable. You should have a wave maker on this tank as well. Hippos need lots of rock work and lots of swimming area here with turbulent water conditions to survive healthy. A 35 just doesn't meet that criteria.
I would highly suggest (unless you are planning an up grade) to return the hippo and get two more clowns or a dwarf butterfly (one only per tank)
Saltwaterfish.com is a great site to check out various fish and their compatibilities with other fish. you can see a picture and read about their care. Right now I think you need to take a step back and think about where you want to go with this tank. Check the site out they are really helpful.
Your tank really isn't large enough to house too many of the larger "Exotic" looking fish.