I don't think those are Goldfish. At least in the pics they look like Koi.
Koi are NOT aquarium fish. They need ponds.
Koi growth
"The first year the fish should grow to 8 inches
By the second year, the fish should grow to 12-14 inches
By the third year, the fish should grow to 16-22 inches
By the fourth year, the fish should grow to 24-28 inches
In the later years, growth of 1-3 inches can be obtained
The largest koi I have personally seen have hovered around the 40 inch mark. "
So far the Angelfish and maybe the Bala Sharks are the only fish that can live out their life in your tank. Balas get hefty.
Adult Bala Shark, not a shark, a type of big minnow.
Adult Iridescent Shark (Not a shark...a catfish).
Adult Common Pleco
( not my pics. All off Google)
I realized when you wrote Algae you meant Angelfish. I read it as Algae Eater and assumed Common Pleco. It's late, I read it wrong.