how often should you do water changes

llduce10

Reefing newb
i have a 30 gallon tank, with 5 fish, 2 crabs and about 15 lbs of live rock, how often should i do a water change and and whats the max number of fish i can have..is 7 to many???
 
Really five is too many. You're kind of overstocked already.

You can opt for either 20% every two weeks or 10% once a week.
 
+1 Erin

You are also really low of rock, you should have at least 30lbs.

Rule of thumb with fish is one small fish for every 10 gallons.
 
Stocking rule of thumb is 1 fish per 10 gallons of tank volume

As far as water changes, you should be aiming for at least 10% a week (or 20% bi-weekly) but with an overstocked tank, you may need to do a larger percentage - such as 20% per week to keep water parameters in check
 
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