The pain is those Mandarins, you'll likely need to culture or buy pods for them even if they eat some frozen. They also react poor to copper, I personally ttm mandarins and other sensitive fish, for mandarins specificly I set up 14 five gallon buckets with saltwater and a pod cultures with 14 heaters and air stones and move them from one bucket to the next daily. When their done they go in a holding tank, the other fish can join them when copper treatment is done and after fallow all the fish can go back to the DT. There's other ways to ttm, that's just how I do it.
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The treatment I have is 1.3mg benzaldehyde green and 1% PVP per 5ml, is that ok for them??