05-23-2012, 11:57 AM
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While many species of tetra will easily spawn in an aquarium provided the water parameters approximate their needs, survival of the eggs or fry is almst impossible if the adults are left in the same tank and/or there is another fish species present. This is because most fish will readily eat the eggs almost as soon as they are laid; in nature this is much less likely because the parents spawn and then swim off in a huge volume of water, leaving the eggs sticking to a cluster of vegetation or whatever.
I have tetra, pencilfish, corys spawning all the time in my tanks but very rarely do I see fry, though it does happen. If you want to raise any number of fry, a spawning tank is necessary; depending upon the species, the 3.5 gallon tank might work. You can browse our fish profiles, it mentions some of the species that are relatively easy to spawn. Most will require fairly close water parameters, meaning soft and acidic, for successful spawning.