Hello yesterday i went to do a 20-30% water change and realised that there was 5 baby guppies swimming round so to be on the safe side i put in a breading net to seperate them incase they get eaten i brought some baby fish food today but i was just wondering how long should i leave them in the breading net and is it ok to do 20-30% water change if you could let me know that would be great 
my tank has 4 BN's
2 male guppy's
2 female guppy's

my tank has 4 BN's
2 male guppy's
2 female guppy's