I have a 10 gallon tropical fish tank, and most of my fish are dying off now, so can I turn my tank into a coldwater tank? How? What coldwater fish are there that arent gold/black/yellow/silver/bubble head goldfish? Please help, apprieciated!

Sorry about the background you can see my camera

Hey there!
I just got myeslf a new aquarium, and I was just wondering if someone could tell me what species of fish I can buy from my local petstore that will clean the tank for me.
I think there a species of fish called the cleaner wrasse, but I want moer details please.
Btw, I;ve got myself 4 goldfish of varying species.
Thanks.

40mmx38mm i think the size of them and i read online that you should use 80 of them per gallon
ive got 17 gallon tank that would fill the whole tank up with them lol of course i dont put 80 in per gallon ive put in like 20 or so

I wanted to set up a 10 gallon coldwater tank, but not with just goldfish i wanted to try and make it look good without tropical fish ive heard white clouds and borneo plecs prefer cooler temps and i wanted ideas on a good coldwater tank that looks tropical without boring goldfish!

and what is a good bottom feeder match up with fantail goldfish and black moor gold fish like what kind will get along
what could i feed my fantail goldfish and black moor goldfish to make them grow faster

My brothers goldfish died a few days ago, leaving a big plastic tank with plenty of new-ish things. I think he’s lost interest in goldfish now so is there any other type of coldwater fish that can be kept in that tank ?

.

Just an average coldwater fish tank for a couple of goldfish. I went to pick up the fish today and was told they wouldn’t sell fish to anyone without a filter, but the tank is in my bedroom and they’re so noisy. If the answer is yes, I must have a filter, are there any ways to dim the noise? Thank you.

everyone says tropical fish come in more colours and look nicer but when i went to my aquatic shop the coldwater fish theyv got are equally as nice??