I wrote out a reply, but navigated away before replying. Long story short.
If you have light, and water, you have algae. Reduce the lighted period and shorten the time between waterchanges- this will help witht he growth of your frontosa fry.
Only feed as much as the fish will eat at one time. Fish should be well fed, but always with an appetite. Feed a smaller amount, but more frequently. ie. feed 3 feedings of 10 grams of food wrather than two feedings of 20 grams.
If this is a tank for raising fry, best to leave it as is. If this is a showtank where the fry are growing out into, then do the above, in addition to any new fish you put in.