Usually the clean up crew goes in before any fish. If you don't already have 1 you should go buy a test kit for ammonia, nitrite and nitrate. Ammonia and nitrite are fish killers, so you will have to monitor them to make sure they don't elevate and do water changes and or add prime (or something similar) to keep the levels down. The algae for the clean up crew will come after the cycle is complete. and that is when the clean up crew comes in. Usually you would put the clean up crew in and let them do their job for a while before adding fish. Once the fish are added you have to feed them and they poop, adding phosphates and nitrates to the water that in turn adds to more algae. from about a month to about 6 month your tank will have (what I call) ugly tank syndrome. Things will grow that you don't want and you will be in a constant battle to keep it under control. That's why everything in the saltwater hobby is done slowly (at least until you get the hang of it).
All is not a loss though just I wouldn't add anything else until you get some test kits and know for sure the cycle is done. You will know this when you consistently test 0 ammonia, 0 nitrite and elevated nitrate. There are a lot of threads that explain the cycle process so I wont go into that. I would assume since your fish are still living that you added some kind of bacteria in a bottle (micro bacter, stability or something like that), which is good, but you want your biological filter (live rock, bio balls, ect) to be able to keep up with your bioload (fish food, and fish poop) to be able to convert that into nitrates.
Good luck and keep us informed. Don't get discouraged if things don't work out this go around, but do keep reading on how to properly start and care for a saltwater tank. We have all been there and every single one of us, no matter how rude or how friendly, have made mistakes in this journey but even through it all its well worth it.
