DJ ArKaDaRkA
Fishaholic
i think my tanks is cycled its gone 12 hours now without a WC and showing no nirate and nitrate

Looks hopeful. The thing to do now is monitor with twice daily water tests for a week. If they all come up like that, you are good for a few more fish if you want. (I'm assuming you've been fish-in cycling here)
All the best
Rabbut

yes, when it holds steady for a few consequtive days at 0,0 with no water changes then you're cycled and can add a few more fish. be minimal with the amount of fish you add or it'll start cycling again. i'd recommend adding no more than one third of the current fish load, some people say a half is fine but i think it's best to be patient and not push the limits.![]()

This means one lone male or a trio of one male and two females 
Should be OK from a filtration stand point if you get zeros for a week without waterchanges
One possible issue in the making though... You can only have one male dwarf gourami (the brighter coloured of them) in a tank that size, as two males will fight. You also want two females (the silver coloured ones) to each male, or the male will kill the femaleThis means one lone male or a trio of one male and two females
All the best
Rabbut


He will be fine alone. You will often see things that work in shops that won't work at home. Cramming lots of males into a tank stops them fighting because they realise it isn't worth it for a 4" cube of space. This stresses them though and can lead to them developing disease problems if kept thus long-term
The Gourami will settle and calm down given time
All the best
Rabbut