lol I learned my lesson of to much change to fast when I had my first tank which was a 10 gallon, came home from work, the cichlid, and the shark were dead. The only one that survived was the oscar i have in my avatar and he was covered in ich. After that ive been very careful about what i do to the tank.
I understand about the bacteria but if i leave say 25% of the water all the dirt that will get stirred up when i remove the rocks will create a mud puddle for my fish to swim in, then when i add the new water ill be in the same situation all over again. Im sorry if im overreacting, i just want to get this right so im not constantly worrying about the health of my fish...
Are you sure i shouldnt wash the old filter? The clear tubing looks brown, ill post some pics later so you can see the water condition and what not.
Thanks again for helping me out guys!