That's too small of a tank for that many fish. I think you'd need at least a 20 gallon for that many fish. The Glofish should be in a school of at least 5 and so should the guppies. I really think you need to upgrade. Also, what kind of algae eater is it? If it's a pleco, they can get huge.
A male & female Guppie ( the female died ;()
And yesterday my pink glofish was twirling and spinning to its death , the fish was gone for 2 days and then showed up right wen I put my Betta in their