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1. They won't become overly aggressive until they are sexually mature so you should have some time. They may still nip fins on occassion however so watch out for heavy nipping. Females could theoretically be kept in a community setting for quite some time as they are not very aggressive. Be sure they are eating properly and they will grow fast. I'd say you probably have a month. The male will become aggressive sooner once he stakes out a territory. Rearranging things on him often will help stop his agression

2. I've heard of them living in the range of 5-7 years. The lifespan drastically decreases if kept in brackish or salt water although they will tolerate it to a degree. They should be kept in fresh water only.

3. The main breeding tip is to use a lot of java moss along the bottom of the tank. The puffers are very difficult if not outright impossible to breed without it. They won't lay eggs in anything but moss. Water parameters are not very important assuming you avoid extremes. The only truly important water parameter when dealing with dwarf puffers is (aside from ammonia and nitrite which is toxic to everything) nitrates. Keep them low with regular water changes and they'll spawn for you. Spawns tend to be small at < 30 per spawn.
 
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