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Have 60 gal tank with 2 largish Ryukin goldfish, doing well together in this tank for several months. I added 3 times different smaller Ryukin from different sources, acclimated by floating bag method, put in the tank with the larger Ryukin. All new fish died within 3-5 days, w/ signs of swim bladder problem - not remaining upright, then dies. Water tests all zeros, using Safe, API proper ph 7.5 & bacteria. Temp 78. Tank cleaned often.. Eat soaked Hikari sinking mini pellets, peas. Ideas?
Updated On July 23rd, 2017
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Answered By Kelvin Fujikawa 159
Aquatic expert
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You mention that your water tests all zeros. Which parameters are you referring to ammonia and nitrite? If so, have you measured your nitrate level? Though not as toxic as ammonia or nitrite, nitrate is still harmful to fish especially in concentrated levels. Please test your nitrate levels and if your levels are higher that 40 ppm, perform a series of small water changes (10%) every other day to slowly lower your nitrate level to under 40 ppm.
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