On my small cycled tanks I do a 20% change every two days and take it down to where they just have room to swim every week. A couple small plants like anubias or grassy types survive the large water changes O.K. as long as you don't flush them around the tank when filling back up. I do gravel on all water changes, just don't get much done on the 20% change days but it makes a dif.
On non cycled tanks I scoop out a half cup of water, fill it the rest of the way with prepared water from the jug beside the tank then proceed to clean the tank including rock scrubbing. When you're done cleaning you add water treatment to the tank and pour in the water from the jug to fill it and net happy betta back in. Then dump the remaining prepared water out and fill the jug with tap water, shake it a while to sterilize it then put in the right dose of water treatment for it. Cap and set the jug near the tank at the same level in the room. If you use a small heater in your tank, use one in the jug as well and remember to un-plug them both about a half hour before cleaning. Cutting a slit on the handle side of the jug's threads so that the cap can go on with the heater wire below the closed cap is best way to handle heaters, no point in making water that catches dirt and bugs. This way you have a jug of water ready to go close by if something goes goofy in the tank AND the water gets aged.
Last edited by Thunderloon; 02-17-2011 at 01:36 AM.
Reason: added indoctrination into pettaphysics using davinci mapping