Is there such thing as two offten water changes? I have a 29 gallon AIO tank and the back holds about 5 gallons. With all the rock I would say I have about 25-26 gallons. Is a 5 gallon water change weekly to much for the tank. I have been working alot untill I got laid off 2 days ago and I was not keeping up with the tank at all. Everything is living but nothing is growing or happy. I mean the green button polyps have not popped out a new baby in probably 2 months and they use to grow like weeds. But should I do weekly, bi-weekly, or monthly?