Why is my fish's tail color changing?

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cheeky

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It is my moms fish.And he is heka big and he was in a small tank.But my mom got to Chiclets and got a big tank.Then one night the big fish could no breath so she put him in the big one with the Chiclets because maybe his tank was to small for him.But any way.Later on he lived and the Chiclets were beating him up so my mom put him in his originally tank.Then in the morning put him back in the big one.then that night put the Chiclets in the small tank and the other fish[koi] in the Chiclets old tank.So then one Chiclet got stuck behind the filter and died.Then She had another fish outside and put him inside with the koi.And like they are always kinda together are they mating or what.All of a sudden i found out the koi's back fin [but area]was changing colors like peach or orangish.Is that a sign she or he is pregnant or what.Or does he have a diasase or something.Is he/she Ok..Thank$ for the help.
 
First its Cichlids not chiclets. Koi and Goldfish are very dirty fish and need plenty of tank to house them inside. If it is not feasable to put the Koi into a larger aquarium you need to increase the water changes (or actually do some) Get some kind of container to keep water in and let it sit overnight change a little water every 2 days or so. This is not the standard or recommended but theres nothing else you can do. The fish will not make it very long in a small tank. His anal fin can change for a variety of reasons from disease to actually going into breeding colors although the latter in unlikely but not impossible I suppose. Test your water every few days and keep an eye on the fish
 
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