ya but this person has only 30lbs of LR... the mandarin would DEFINITELY starve unless he is eating other foods besides live food. I'd still say wait MANY months if not a full year to add a mandarin...or at least get 100 more lbs of LR if ur tank is a 90 gallon...once you have 130 lbs of LR I'd say then wait a few months and then ur pod population should be pretty high...also, this is just an estimation as to when ur pod population will be high enough...if see tons and tons of pods now then you can add one soon...more likely than not, it will take a long time to see the pods get really high in a new tank.