they only become a nitrate factory if you dont maintain them properly. you really should rinse them well every month. most people are too lazy to do that so then the balls become problematic.
If you dont want to have to do the monthly rinse, then just replace the bioballs with LR rubble (roughly ping pong ball sized). I would not do it all at once. i think 20% per week replacement should work fine.
wet/dries are not problematic if properly maintained. they just require a monthly maintenance that most reefers either dont know to do or are too lazy to do (like me) if there is another easier alternative.
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