How often should I do water changes? Is my tap water safe for fish?
I have a 20 gallon tank, stocked as follows:
1 swordtail
1 molly
1 pleco
2 glass catfish
3 brilliant rasboras
4 ghost shrimp
I’m wondering how often I ought to do water changes (25%). Also, when I do water changes, what do I need to do to make the water safe for my fish? My tap water is extremely [...]