My Dniester River biotope project is almost ready. Here is what I have so far: 380 Liter aquarium plus JBL 1501 CristalProfi Greenline Canister Filter. Almost everything, including sand, I got from Dniester River near my house here in Tiraspol. Here is the fish list: 5 Monkey Gobies, 2 Toad gobies, 5 unknown minnow type fish)
Sand or Monkey Goby in front of it's little cave
The light brown and green coral looking things are freshwater sponges Spongilla fluviatilis. Yes, they living colonies. I am pretty sure that they are the same species, but the green one was pulled from cleaner water and has algae inside of it.
River Sponge and Unknown River Plant from Dniester