You can add a filter. Follow the cycling sticky. Also read up on proper water change schedules during the cycling period. Cycling will change your water parameters. It is good to have a decent testing kit on hand if you do not already. Good luck.
Hi got a question can i add a filter right away in my tank with a fish? It helps cycle the tank but my tank is always good no ammonia or anything but i want to make it better i just want to know if the filter will affect my tankl
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