hello fish lovers,

i've been doing 100% water change to my 2 fish tanks every 2 weeks......my first fish tanks are stocked with 9 blood parrots while the 2nd one is stocked with a flowerhorn. so far, i have not bumped into any problem of doing a 100% water change, i mean the fish became active again in an hour or so........

however, in many forums and websites that i have visited, i noted that 100% water change is not recommended.....and the thing is that i have not encountered any problem with it so far....so can anyone pls explain.......

and one more thing.....can anyone pls enlighten me on the reason behind doing a 20% or 50% water change???

thank you in advance!