Some advice please for container pond

I have recently emptied my raised pond and the 2 swan mussels, 1 snail and 1 black thing with legs that flits about ( no idea what it is ) are now in a plant pot. The pot is about 2ft high and 2ft wide. Can I use this as a permanent home for the water creatures or will it be too small? If its ok to use should I leave the layer of gravel and sand as it is or try to add some aquatic compost as well - as the bottom area is so small I'm thinking that any plants I add will need to be planted directly into the bottom instead of it pots.

 

Hi, I am not an expert but my guess is "yes", you can have a mini pond in that space.

 

A mini water lily will help the wildlife and look cool. Maybe plant it or any plant in a pot with aquatic compost with stone chip covering the soil. Put it on a brick sitting in the pot so it gives different depths and makes it easier for bugs to get in and out too.

 

The bottom of the pot is smaller than the top, hence wondering about available space. If I start adding pots and bricks its going to cut that space down even further. Old pond was around 90 gallons, maybe more. I don't know how much space the mussels need?