I wouldn't risk using the rock that was in the qt again unless you disinfected and clean it with a bleach solution. Then let it dry fully under the sun, rinse with fresh water and then put it in your main DT, let the tank run fallow (fishless) for a min of 72 days. This way it will be live for you to use again and parasite free.
Also throw away the bio ball. not needed.
always qt anything wet.
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Ryan.
300g with velocity t4 for return and a Reflo dart on a closed loop, T5 lights & SRO3000 skimmer.
Current Tank Info: 300g
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