I have 3 tanks. 1 with my fishes and 2 other are technical. The smallest one is 0.5l and I'm using it as trash bin where I put dead plants and algae from main aquarium and it has sand from the see at the bottom. For more than 5 monthes it was full of algae and no alive creatures. Now it has many live black dots that are very fast moving and now the tank is very clean. Second technical was planned to used for daphnia (didn't get it yet). It has 5l volume now. In the bottom it has simple ground and rasied Glossotigma eletinoides from the seeds. Also it has many algae (including Spirogyra). Two tanks are closed tightly.
I have a some questions about it:
- What kind of animals are these?
- Can I move black dots to the other tank to have it clean from algae?
- Are these creatures safe for me?
- Are these creatures safe for my fishes?
I recorded video, it has 3 parts (1 tank, 1 tank in zoom, 2 tank in zoom): https://youtu.be/3jbqPiAcKOc