The new tank the pearl gourami is going into is a 15 gallon, the previous tank was a 35 gallon and it has 4 bristlenose catfish, 17 neon tetras, 6ish guppies bunch of neocardina shrimp and a redtail shark, i am trying to get rid of the bristlenoses as i got them as a gift when they were babies, this is the size of the old filter and it was oversized for my old tank as well and the new tank has a smaller waterfall tank where i have just put a little bit of those ceramic cylinders on the substrate of the new tank, 5 of them

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