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Thats a normal black shark
Grows to 2 1/2 feetand will kill and eat everything else in your tank including the frogs
For what you have in that you need at least a 180 gal tank.
And you will have one fish in it ...the Black Shark.

Oh, I see by your pics that you also have Tinfoil barbs.
Another bad choice, and I see your tank is 55g.
Tinfoil Barbs also get to be around 14 inches long, are schoolers, and are fast active fish. They really need around a 125g tank at the minimum to be happy, though that would be pushing it a little I think, and at least 6 of their own kind.
The 3 frogs would probably be quite content in a 33g minimum size tank.


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Oh, and the "Dwarf Albino" frogs, are probably African Clawed frogs. These beasts can reach sizes of 8-12 inches, sometimes more. They will eat any fish small enough to catch once they get large enough.
How big is your tank can I ask?

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Yep, your black shark is a normal Black Shark. He will easily reach around 30 inches. My parents had one unknowingly as well when I was a child, and within a year he went from about 2 inches to 12.
Just like their rainbow and rtbs cousins, these guys are aggressive, and grow fast.
Unless you have a tank of 250 gallons to move him to, I would highly suggest you take him back to the LFS.
The chinese algae eaters get quite large, and stop eating algae entirely by the time they reach 5 inches or so. They are really a lousy algae eater. Usually around the 5-6 inch mark they change their appetite from algae to fresh fish. They are well known for their attacks on other living healthy fish. I would also return this fish to the LFS.


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