After cycling for 4-5 weeks

Have checked ammonia and nitrates? If they are at 0 than your good to go. If not continue on with the cycling process. Once complete you can do regular 20% wc or none if your tank will allow you to get away woth it.
Ps. During cycling you should do wc every week of between 20 and 50% I believe. If om wrong I'm sure someone else will chime in.
Gl

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if your ammonia and nitrites are both at 0 then I would check nitrates. If they are over about 20 or 25 I would do anywhere from 15 to 25%.
 

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