How often should i water change. Finished cycling and put four platys in on Sunday they are fine. Did a 30% water change on Monday as advised by my LFS. Water has a hint of red in it from bogwood(which i did soak) so apart from wanting to chnage water for fishes benefit also want to dilute it to remove the reddish tan too.
Cheers
When you say you've finished cycling, did you do a fishless cycle by adding ammonia over a month and checking the water stats or did you use a bottle product and leave it for a few days something like tetra start?
The reason I'm asking is that if the LFS told you to change 1/3 of the water the day after adding fish it sounds like they expected there to be issues with ammonia/nitrite levels. What are your ammonia and nitrite levels? If these are high then you will need to do frequent small water changes while your tank cycles, otherwise about 25% each week is good enough.