it seems like alot of fish so personally i wouldnt put that many fish in a 75 gallon then again thats a massive tank and there all small fish so it could work, but i havnt had a 75, my biggest is a 55 so im not sure. although i think the best way to get fish is to introduce them slowley like add 10 tetras and then 2 weeks later add 10 danios, baby steps like if its a new tank, never add alot of fish quickly as well, its really up to you as technically it would work but its more about how well they will survive, will it be too crouded, some fish like schooling like the danios so yeah. maybe ask the petstore owner or someone whos had one before. id personally add some fish and just stop when you think its enough, you might ad some tetras, love the scape and just them in there and finish it at that.