The tank has java moss, java ferns, Amazon swords, frogbit , and water lettuce but the floaters can't seem to stay a good coverage because the convict cichlid loves to eat themYou could do what others said and shorten your photo period but it’s not really solving your problem since the tank is establish. Are you able to adjust the colour of the light or intensity?
Do you have any floating plants? Salvini,duckweed,hornwort? There may not be enough competition for the algae in your tank. Nearly all fast growing plants will reduce the effects of algae. Unless it truly is an over abundance of diatoms.
I believe I can adjust the intensity of the light as well. I really appreciate the help