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Blue Gourami with black head — is he sick?

April 26, 2017Black BLUE gourami Head sick

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Blue Gourami with black head — is he sick?

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Thanks for your comments — I get the suggestion about the size of the tank and about not feeding them when only away for 3 days. Will do. I need to explain about the heater being off/on. The tank is located near a heated radiator (yes, I live in a home that is 80 plus years old and is heated with radiators, not vents or baseboard heating) and it is located near a window that has sunlight coming in most of the daytime. So, the heater is not always on because the temperature spikes so severely in the winter daytime when it is sunny. I’ve tried different heater types so that I do not have this problem and it’s the same. Moving the tank is not an option — no other location for it. When we go away, however, the heater is always on. This was the case this past weekend when we were away.