Make sure you have enough algae to support the ottos and that your tank has been running for at least 3 months...........Ottos, dont like new tanks..........
Randog, your books theory on the amount of fish you can keep per gallon of water has alot of holes in it..........Going by the math equation of fish length, that would mean i could keep 4 5 inch oscars in a 10 gallon tank....What about tank depth?...........Some tanks will have the same surface area, but be deeper in depth?.......Stocking for a certain size tank will all depend on the fish and the size of the tank...........a 4 inch oscar will have 10 times the waste of 4 one inch tetras............The larger the tank is, the easier it is to get away with over stocking the tank, to an extent..........Good filtration and tank cleaning is the key to keeping a tank healthy and happy
