The BB is the same for both tanks.Thanks! I already have a 29g community thank with a moonlight gourami black neon tetras ect. I would normally just do a another community tank but I'm worried the good goldfish bacteria would not work for tropical fish so I'd have to recycle
Theoretically you could do 2 black Moore in the 30g. If they look cramped as they grow then you could move them.
But basically 20g for the first fish and 10g for the 2nd fish sounds right to me.