I think 20 is ok too but just to be safe I want it to be lower than 20.
Right now I have 2 male (they are the survivors from last group) and 4 female, 1 of the female is pregnant when I bought her yersterday and looks like she will drop soon so I put her in a small tank with some 4-5 weeks old neons
Right now I have 2 male (they are the survivors from last group) and 4 female, 1 of the female is pregnant when I bought her yersterday and looks like she will drop soon so I put her in a small tank with some 4-5 weeks old neons