Lol I have this problem too. I walked to the fish store the other day with my own money and this happens...
Mom: "You better not buy any fish!"
Me: "But it's my money, so why not?"
Dad: "No honey, theres just no room for it. no.
Me: "Actually I have the room for it!"
Dad: "Well you don't have the tank for it, so no."
Me: "But I can afford a tank AND a fish!"
Dad: "Don't talk back!"
Mom: "Listen to your father!"
LOL. But, my parents would let me get a fish if I already owned a tank... they'd just wait a month before letting me go to the fish store. Try telling your mom that studies show that watching fish lengthens your life span by relieving stress, and the more fish you can watch the longer you can live.
I would just show your parents that you are taking good care of the one you have and that you are a responsible person,. I think a lot of parents feel like their kids will get tired of a pet after awhile and they will end up having to take care of it. At least that's how MY mom felt and still feels, even though I'm 49 years old! lol Also, make sure your schoolwork isn't being neglected and that you take care of whatever chores you may have around the house.
She'll give me the "You spent $100 on your stupid fish in three months" (It was actually about $140- shhhh, don't tell her that :P)
I spent $250+ in one day But my family knows my little fishies keep me happy and busy, so they are fine with it, and even help when I need food or want to try something. I think simply saying they make you happy will help your case ;) good luck.
And the thing is, I don't know why she wouldn't let me.
My GPA is 3.667 and climbing.
I get my homework done.
I make my own food.
The only thing I have an issue with is keeping my room clean, and I'm working on that, but I still diligently keep up with water changes. I've been changing Mister Fishy's water 100% every day and adding 1.5 tsp/gallon of Epsom salt for the last 4 days with every water change because he has popeye. If he didn't have popeye the amount of money wouldn't be quite so much.
So I think I've long since proven I can take care of my pets and keep up with my priorities at the same time.
Now I just have to figure out how to talk her into it.
Maybe I'll get my BFF to help. She's coming to see me tomorrow, and she lives on the other side of the country so we only see each other once a year, and I bet she could convince my mom to let me get more fish.
What I did was went into petco with my dad (who loves fish and is planning to let me get unlimited bettas when we move) and saw Sunny. I just sighed and was like "Dad, I love him so much. Please! So rare..." and he said, "We'll find another," So i told him I probably wouldn't and he was like FINE, DON'T TELL GRAMA. :D