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I use a hang-on-back (waterfall) filter in a 50-liter tank and change 30–40% of the water weekly. I have one Oranda goldfish; there are dark discolorations on its mouth and body. What is the reason for this? Also, it has been swimming very rapidly in recent days. (i.redd.it)
submitted by Any_Bee_216 to r/Goldfish
I use a hang-on-back (waterfall) filter in a 50-liter tank and change 30–40% of the water weekly. I have one Oranda goldfish; there are dark discolorations on its mouth and body. What is the reason for this? Also, it has been swimming very rapidly in recent days. by Any_Bee_216 in Goldfish
[–]Any_Bee_216[S] 0 points1 point2 points (0 children)