Aquarium as best photograph without Dslr?

I have a question, you can photograph an aquarium with 🐠 synonymous with a conventional cell phone camera, I have a Huawei p20, but somehow the photos are always nothing, sometimes very blurry, I know with a dslr camera 📸 that would be easier, but for my use just too expensive… Maybe you know yourselves from thank you

Just do it.

If necessary, with an additional light behind the aquarium for more light.

Otherwise, there's absolutely no risk. The fish will not disturb it. And either the picture on your phone is ok, or you try it again. Storage space and electricity is cheap.

You need short exposure times and avoid reflections. So bring as much light as possible. How it looks best, you have to try. It depends on the aquarium and its inhabitants.

The best way to avoid reflections is to press the cell phone flat against the aquarium disc.

I know with a dslr camera 📸 this would be easier

No, that is not so. The problems are ALWAYS reflections and dirty windows, no matter which camera you use.

You have to try and learn.