How many Kribensis in 30 Gallon tank?

If you're planning just a species tank with nothing else and provide lots of caves, probably 5-7. If you're going to have other fish in the tank, I'd say no more than 5.
 
I may be wrong but I think that the minimum tank requirements for a pair is 20 gallons...so I'd just put a pair in. That way you will also be more likely to experience the Kribs breeding. Make sure their is a lot of hiding spaces (Overturned plant pots, driftwood, rock structures, coconut shells) so the female isn't harassed by the male when breeding.
 
People also say the minimum tank size is 500 gallons to breed festae and people do it all the time in 75 gallons. I don't know where people pull these numbers out of, but I think it's the air and not scientifically proven.
 
all up to you. there isnt an EXACT number u must follow, but you need 1 male to 1 female. so you need an even number in the tank to try and stop bullying. also lots of hiding places.

caves and coconuts can be used if they are cleaned very very well
 
Hey, you know what?

This person has asked about how many rams, yellow labs, and then a few communtiy tank members, and now kribs!!

What are you going to put in your tank? You've asked things like this soooo many times for a 30g, just curious why you keep changing your mind.

Srry. I can't help being blunt sometimes ;) .
 
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