The fish might be fine to survive, but it dosn't mean it's happy. Where is the filter? The Heater? The Plants/Decor?
I agree with Sakura on the whole husbandary topic as well. So many people don't realise that putting their fish in unsanitary environments and small tanks is what's killing it. Common belief is that fish die easy, for no apparent reason at all.
Mulan: Blue/Green/Red HM Male
Those who now swim in the Rainbow Ponds:
Spike: VT Purple Male
Glaedr: CT Yellow Male
Ezio: DeT Dragonscale Male
Stu (Founder of the obsession): CT Blue Male