I have a 55g with 2 2" ebjds and a 5" chocolate pleco. How often and how much water would you suggest changing? I have had the tank running for about 2 and a half weeks and fish in it for about a week to week and a half. I have done 1 15% water change about 6 days after the fish went in. Should I be doing more water more often?
I had planned a 10-20% once a week and then a 30-40% once a month.
I had planned a 10-20% once a week and then a 30-40% once a month.

I test my water every few days for nitrates. I have a pretty strick w/c schedule, but I never let my nitrates get above 20ppm. But they rarely get that high, cause I do a 100% w/c every week. Which is 2 back to back 80% w/c's.