just a note on posting images... i use photobucket.com, where i upload all of my pictures and then link to them. photobucket is nice as it has the image links already there for you, you just have to copy & paste them. 
Unless the difference is so minuscule that it will not affect the fish anyway, this will not be enough time for acclimatisation.If they differ (say a lower ph in the existing for one example,) then I would bag the fish and do a mix in small amounts of the new water over a 30 minute period, then net and drop. The filter would then follow the fish to the new tank.
The point is that you might not be transferring between the same water. Water parameters in a tank change after the tap water is added. For example, nitrification acidifies the water, denitrification does the opposite. In an ideally balanced tank, the GH, KH and pH will not change from the tap water parameters, but I have never seen a tank like this. I have 4 freshwater tanks right now and every one has different water parameters which are different from my tap water. The difference between the highest and lowest GH and KH readings is around 10 degrees (179 ppm), which is a lot.That's excellant Kittykat but if I'm transferring from my own water to my own water is it still necessary?
What species do you keep? Different ones have different requirements, but as a general guideline, soft water species tolerate hard water much better than hard water species tolerate soft water.Another point is my water is very hard so I have an artificial softener. I have a tap of drinking water that contains no lime and a tap for general use such as cleaning, cooking etc that contains a little lime and I'm unsure about the salt content for either. I use the general use tap for my aquaruim. Do you reckon this is ok?
At that pH, it's probably high. I would guesstimate at least 8 degrees. Normally, high pH means hard water.My ph is 8.2. Must admit I don't know what kh is.....![]()
!!!!!!! Will I fill up the Rio even though it's not planted yet and not all the sand is in and put the fish in??? Hhhheeellllpppppp!!!!!! I'll post this in the emergency section too in case no one sees it.Well Tizer I've filled the bloody new tank and went to the old one to get the media out and when I took it out it started bloody working again. My house is in uproar. Will I just make the switch today, putting the fluval running alongside my rio one? I know I can't add more fish than I have for a good while but I don't mind that.

Sorry, another quick question! Can I just put my 2 sponges from my old filter into a space between the sponges in my new filter and hey presto!? I'll have to fold them over a bit.Thanks a million for your help Kittykat!
Sorry, another quick question! Can I just put my 2 sponges from my old filter into a space between the sponges in my new filter and hey presto!? I'll have to fold them over a bit.

