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I think it is time I start thinking about resetting my tank and ordering supplies. My taiwan bee tank is up to PH7.5 (I need to check this though with a NEWER test kit first to check the kit is working correctly) and has been creeping up over time. There are no obvious signs of a problem with the shrimps whatsoever (incidentally I had half hoped that it may slow down the breeding but it appears that was not the case, dammit), so I am not rushing into doing this but as summer seems to be arriving I feel less reluctant to faff about with buckets of water than I have until now! The tank has been running on JBL Proscape shrimp soil but only the one bag of 3L which is about 3//4 inch and clearly that may be why it hasn't lasted as long as I thought it would so I am planning on using 2 x 3L bags this time which should be about 1.5 inches, Is that enough? I only used 1 bag before as I have to admit I don't particularly like looking at inches of dead space at the bottom of a tank when it has a clear glass front so you can see the substrate. I did have a geode in the tank as decoration but that has been removed now, but that may have affected the PH etc. It has 30L of water in the tank. The water that goes into the tank is Ph 5.5 so I'm not sure why the Ph has risen tp 7.5 other than the geode maybe????? My questions are, 1) Is 1.5 inches (6L) of substrate sufficient for 30L tank? 2) Will having more substrate than before extend the time before the tank needs to be reset again or will it not affect the length of time the soil works/buffers? 3) Do I even need to change the soil and reset the tank as everything seems to be fine otherwise? Allowing 1 week for getting the stuff and then the 2 weeks prepping the soil in the bathroom it will be a month probably before I actually do the mammoth task of changing everything around. Simon~