will this work ?

[damtrees420]

I have a 100 gallon tank 5 ft long so its not that deep it has a fluval 405 and i was going to add a fluid sand bed filter and a protinen skimmer with the live rock the tank is not drilled and im not to sure how to tell if i can drill it.i am wondering if this setup will work for a saltwater setup without a sump or am i better off going with a sump ? please and thanks