Wow! For a 4 month old tank it is stocked pretty well already. You will need to keep doing the water changes, I would bump it up to a 25% for the next few days, every other day(25 today-25 thursday-25 sat) you should be pretty much under control (hopefully) make sure the water temp and salinity are the same as the tank. DO NOT FEED ANYTHING! The Emeralds should do a good job on the hair algae, but you may need to pull the rock and scrub it to get the algae under control, the problem now is the bubble algae, it will spread if it is popped, so be careful. Once this is under control I would heavily monitor my feedings and even though the tank is four months, it will still conmtinue to cycle in small stages for a while. I think you should let it do its thing without adding anything for a while, as tempting as it is. Believe me i have gone down this road many times.