Hi, i am new to this.
I have never rare fish bfore.
I only rare other types of animals.
I just bought one gold fish in a small tank. with a small filter.
It's a small gold fish. Not big size.
It has bubble looking bags on their forehead and eyes~

I wanna ask, when i change water weekly.
1. Do i need to wash the filter as well?
2. Do i need to keep half the previous water in the tank?
3. Need to anti chlorine rite?
4. Do i need to add salt??? Some people say add salt, but the seller never ask me to add salt o. Then if i need to add, how much to add?
5. Am i able to put my hand in to play with my goldfish?

Please teach me pleaSe.
I see many people saying that goldfish die very fast and all.
I dont want my fish to die!
I want it to be healthy~
Please let me know if you guys can help^^

Haha~~
Thanx for teaching me~~
Now i know~