Hi,

Just wondering if i am overstocked?

2' tropical tank
75 Litres of water in the tank / 20 US Gallons
500Litre/Hr hang on filter
gravel substrate
live and plastic plants

Fish:

3 leopard danios
3 zebra danios
4 gold danios
2 bronze corys (2cm long each)
2 chinese algae eater (6cm long each)

every week i do a 20% water change - and ammonia and nitrite are always zero - i dont have a nitrate test kit - yet. but would think some live plants and weekly changes shld take care of that at the moment.

Feeding is once a day.

Could i add more without increasing the bio-load? all fish are very happy with one another.

Thanks!
-Julian

The CAE's get to be 10" long (25-30cm, roughly), so if you plan on keeping them, I wouldn't add any more. I've heard that they only eat much algae while they're young, and when they get older they need more protein-rich foods like pellet foods, or live, frozen, or freeze dried foods. I just found a web site that says they get territorial as they get older, so 2 would probably beat each other up in a 20 gallon, or at least be really stressed.

Corys like to be in groups of at least 4 or more, but if yours are happy and healthy so far, that's not a problem. If you got rid of the algae eaters, you could add maybe 2-4 more small fish, around the size of the danios or some of the smaller corys (the ones that only get to be about 2" / 5cm).

Some people use the rule: 1 inch of fish (adult size) per gallon of water for tropicals... so assuming each danio and cory gets to be 2", that's using up 16 gallons... adding in the two 10" CAE's, it would obviously be VERY overstocked.