My tank is 29 Gallons with 5 false julii corys (1 is a child), one fairly big mystery snail and 2 nerite snails. I have had my tank around 3 months (after it was cycled for a month and a half). I recently got one amazon sword (my only real plant) but my snail has eaten most of it. I upgraded my filter two weeks ago (seeding it with the old filter media) with no spikes so I am not really sure if the filter is cycled or not.How big is your tank? What other tankmates do you have? Is it planted? Is your filter cycled? How long has the tank been established?
3 danios shouldn't crash a cycle... Also, bioload actually is how much food is going into a tank and being eaten and pooped out, not how many fish are in there. So if you add fish, and feed the exact same amount as you did with fewer fish, your bioload should be nearly the same.
Thanks for your help! I appreciate itSo I think if I were you, I'd give that new filter like two more weeks to get nice and established, test your water frequently to monitor ammonia, nitrite, and nitrate. Once everything is super stable, I say go ahead and get your danios. Maybe get at most 6, but somewhere in the range of 3-5 really should not upset your cycle. Feed very sparingly at first, and slowly build up until you're feeding everyone the right amount. I would also recommend getting some more live plants- java fern is pretty and so easy to grow as long as you attach it to wood or something. Hornwort is easy and fast growing, and just floats. That will help consume any excess nitrogen.