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    Why do my 2 fantail goldfish just float in the tank????

    hi everybody! I have 1x Blackmoor and 1x Fantail in my biorb 15L, I've had the tank set up since October and the Blackmoor is original to my tank after 6-7week of tank fish less cycle! Got my fantail about 2weeks ago as I felt like my Blackmoor was lonely and always was looking for attention...