I bought a little pet fish as a pet last month. I bought a little pet fish last month.

What you wrote is good and correct, but this is a little more compact and smooth.

I bought a little fish as a petpet fish last month. I bought a pet fish last month.

It's a small betta fish with a beautiful tail. It's a small beta fish with a beautiful tail.

It's a small betta fish with a beautiful tail. It's a small beta fish with a beautiful tail.

Its body is blue, butand the end of its tail is red. Its body is blue, and the end of its tail is red.

A few days after I bought it, the little one seemed a little lonely. A few days after I bought it, the little one seemed lonely.

And people told me I couldn't buy another fish for it because they would fight with each other untilto the death. And people told me I couldn't buy another fish for it because they would fight with each other to the death.

until death is grammatically correct, but this is a more common expression for it

And people told me I couldn't buy another fish for it because they would fight with each other untilto the death. And people told me I couldn't buy another fish for it because they would fight each other to the death.

And peopleI was told methat I couldn't buy another fish for it because they would fight with each other untilto the death. I was told that I couldn't buy another fish because they would fight to the death.

When the snowflakes arrived, I found the container nowasn't big enough for them, so I ordered a bigger glass fish bowl. When the snowflakes arrived, I found the container wasn't big enough for them, so I ordered a bigger fishbowl.

I think people assume fishbowls are made of glass

When the snowflakesy arrived, I found the container not big enough so I ordered a bigger glass fish bowl. When they arrived, I found the container not big enough so I ordered a bigger glass fish bowl.

Using pronouns can avoid repetition.

When the snowflakes arrived, I founI realized the container nowasn't big enough when the snowflakes arrived, so I ordered a bigger glass fish bowl. I realized the container wasn't big enough when the snowflakes arrived, so I ordered a bigger fish bowl.

Your sentence is correct, my correction is a recommendation. ^^

Now I have a big glass bowl with a single, tiny fish and three water snowflakes in front of my yoga mat. Now I have a big glass bowl with a single, tiny fish and three water snowflakes in front of my yoga mat.

Now I have a big glass bowl with a fishmy fish in a bigger bowl and three water snowflakes in front of my yoga mat. Now I have my fish in a bigger bowl and three water snowflakes in front of my yoga mat.

Every time I practice yoga, the beautiful little fish also seems to like to exercise with me. Every time I practice yoga, the beautiful little fish also seems to like to exercise with me.

Every time I practice yoga, theis beautiful little fish also seems liketo exercise with me. Every time I practice yoga, this beautiful little fish also seems to exercise with me.

Every time I practice yoga, the beautiful little fish also seems to like to exercise with me. Every time I practice yoga, the beautiful little fish also seems to like to exercise with me.