I feed mine every other day or so and do occasional (about once a month) 1 gallon water change on the bookshelf tank, every two weeks for the 10 gallon. Did WC on both tanks this week when I moved opae and trimmed the chaeto.
The shrimp are very happy, it seems. :-)
PS: Are your opae breeding yet? How big is your bowl and how many shrimp?
Sent from my Samsung Galaxy S III using Tapatalk 2