alphauk101 said:
i have 6 black widows and 11 neon tetras and one albieno catfish
in a 50l tank is this to many or could i have more
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**EDIT** changed maths around**
You tank is about 13 US gallons, or 10 UK gallons.. I'ma round to 12.
The rule of thumb is 1" of fish per gallon, but it can be stretched t an extent.
Black widows are about 2 inches each. That equals 12 inches of fish, you need 12 gallons for them.
Neons can get to about 1 inch, so you need 11 inches for them. 11 more gallons.
WITHOUT the catfish, you have about 25 gallons of fish in a 12 gallon tank. A little overstocking is fine, but you are very overstocked from the sound of it. This is my personal suggestion -
Either get rid of all the neons, or get a 10-15 gallon tank for the neons, and keep the black widows in the 12 gallon.
The catfish seems like a whole 'nother little mess... Some catfish are tiny (2 inches), some are huge (2 feet). We really need to know what kind it is. I suggest surfing around
herehere and tell us what kind it is.
Hope that helps, I'm new to this so someone might want to correct me or offer otehr help

I might have done some maths wrong.
Katy