It depends on how big is your tilapia and your Fei Fong.
Fei Fong can be quite aggressive sucking on other fishes if they are hungry.
I have a 5ft tank that has morning sun and high UV the whole day. Tank and filters always crowded with algae, threw in 10 pcs Cherry shrimps and the population became 200+ after 2 months - no feeding just top up water every 2 weeks.
Then something happened to the water and the algae turned pale green and most of the shrimps disappeared. I changed half tank of water and sucked out as much algae as I could and threw in a couple of suckers and a few angel fish but wall algae started growing again and I bought a bag of tilapia feeders and threw them in.
My tank is now completely free of algae, no fights between Angel fish and Tilapia but have to throw in pellets every day for the Tilapia.
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