04-12-2008, 01:26 PM
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It sounds like you have a ton of ammonia in your water. This leads to darkening colors to an unhealthy life. What are your ammonia and nitrite levels?
In the long run, these Fantails will need a 55G tank minimum. They produce massive amounts of waste, and will reach 10" long (with tail). The 20G tank wouldn't be the best thig to do, as you will need to upgrade again. The 20G, however, can be a temporary holding tank untill space is met.
What kind of filtration are you running?