40g., with a secondnatunre whisper power filer (C), 1 Heater,Gravel sup. 3 Ornaments. 2 Black mollys,2 spotted tetras ,2 Tequila Sunrise Delta Guppy, 2 Red Wag Platy, 2 Silver Mollys, 2 White Clouds,& 1 Catfish ? Black& Gold ,Plants- Anubias barteri , Elodea densa ....Had a 20g. with Black mold...