Recently my betta fish, Gloopy, got sick and has lost color and is laying at the bottom of the bowl on his side. The bowl is clean, and I have taken out a piece of real coral because I read that it can effect the water? I have been reading already about the sick bettas people have had and learned that they can thrive in the 2.5-5 gallon tanks the best, and I have a 5 gallon tank that we put my Goldfish, Halpert, because he was (what we thought) pretty big... but I am thinking about switching it so Gloopy can live. Halpert is approximately 3 inches long and 1.5-2 cm wide. The betta is regular sized, I can't measure him at the moment... = (. I am wondering if I should switch their tank and bowl, and if I do do I need to change the water and let it sterilize before putting Gloopy in a goldfish's old water or Halpert in a betta's old water? Thanks. Please answer quickly, we are also looking for another tank if needed.
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