I went to the aquarium in Busan and it is so fun here.
The first tank is for the sharks and seahorses. 
They are interasting and scary.
The second tank is for the fish and penguin. The penguin is more cuter than the fish.
I'm so happy because next week we will go again to the aquarium.

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1.
Anna: im went to the aquarium is so fun here is busan
Correct: I went to the aquarium in Busan and it is so fun here.
Explanation:
*Use I instead of I am to tell your action. (go to the aquarium)
*Always begin your sentence with a capital letter and end your sentence with a period.

2.
Anna: frist tank is sharks and seahores
Correct: The first tank is for the sharks and seahorses. 
Explanation:
*Always begin your sentence with a capital letter and end your sentence with a period.
*Use the article 'the' in this sentence.
*Use for the to say that the first tank contains sharks and seahorses.
*Check your spelling of the word first and seahorses.

3.
Anna: interasting and scaly
Correct: They are interasting and scary.
Explanation:
*Always begin your sentence with a capital letter and end your sentence with a period.
*Check your spelling of the word scary.

4. 
Anna: second tank is the fish and penguin penguin is more cuter then the fish
Correct: The second tank is for the fish and penguin. The penguin is more cuter than the fish.
Explanation: 
*Always begin your sentence with a capital letter and end your sentence with a period.
*It is wrong to say more cuter. It should be cuter.
*Check your spelling of the word than.
*Use for to say that the second tank contains fish and penguin.

5.
Anna: im so happy next week again the aquarium
Correct: I'm so happy because next week we will go again to the aquarium.
Explanation: 
*Always begin your sentence with a capital letter and end your sentence with a period.
*Use because to explain your reason of being happy.

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Hello, Anna! Thank you for submitting your homework. Please read the following corrections and explanations carefully. If you have questions and clarifications, you can ask me in our class. Thank you!