Help with photos for a book

[Seadragon1]

I am wrighting this awesome aquarium fish identification book and I was wondering if I could get photos for them here. I am unsure of copywright laws but if I could I would be more then happy to give credit. I need photos of inverts, fish, corals, and fish illness identification. Any help could save me weeks of citeing every website and photo so thanks in advance (-:

 

[Seadragon1]

Well figured out that there's lots of ways to get free photos for my book but the only problem is i cant find the less common fish right now I cant find
blue assessor
yellow assessor
white bonnet anemonefish
multicolor angelfish
shepardi angelfish
purple mask angelfish
candy basslet
pinstriped basslet
and a LOT more any suggestions for a good website with free photos