I will note that over crowding is the fastest way to kill fishes and be aware what we think is over crowding is not always the same thing as the fishes consider as over crowding. In my 29 (the a. wolli tank) i have 9 fishes - 6 small dithers n. marilynae; i would only consider 4 more n. marilynae (these are small fishes - in terms of mass smaller than ember though a bit longer).
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in my 20 long i have 13 fishes - 2. a. sp Blutkehl; 7 n. morthenthaleri and 4 generic otto - i consider this fishes marginally over stocked - attached is the male a. sp blutkehl. I do have some denser stockings - my 600 has 13 clown loaches and some other stuff. Anyway one recommendation i do have is don't mix asian with sa fishes - it increases the chances of something going wrong.
Obviously some of the live-bearers will end up fairly dense - when i was in college we had a 20 with a couple of swordtails by the end of the year there must have been 30+ of vairious size swordtails. They appeared incredibly healthy given their numbers - of course most not that large. Guppies been there done that until my brother fed them toothpaste. Happy guppies mean million of guppies.
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in my 20 long i have 13 fishes - 2. a. sp Blutkehl; 7 n. morthenthaleri and 4 generic otto - i consider this fishes marginally over stocked - attached is the male a. sp blutkehl. I do have some denser stockings - my 600 has 13 clown loaches and some other stuff. Anyway one recommendation i do have is don't mix asian with sa fishes - it increases the chances of something going wrong.
Obviously some of the live-bearers will end up fairly dense - when i was in college we had a 20 with a couple of swordtails by the end of the year there must have been 30+ of vairious size swordtails. They appeared incredibly healthy given their numbers - of course most not that large. Guppies been there done that until my brother fed them toothpaste. Happy guppies mean million of guppies.