Doug

i belive it is the calcium carbonate (CaCO3) that reacts to the acid in vinegar. limestone breaks down quite easily in water, and I would imagine the consant PH swings would be a bad thing. I just changed all the substrate in my 20L tank when I found out it was causing the PH to rise form 6.8 to 8 everytime i changed the water. I didnt want to have that kind of problem in my new tank, so guess i will collect a bunch of rocks and soak them in water overnight and test the PH of the water see if it changes. Doug

thanks for the tips guys. any types of rocks to avoid, I'm going for a general comunity tank with ph 6.8, or as close as i can keep it. gimme a month or two to ge the tank setup and some fish in it and i will post up some pics. Doug

I'm going to be getting a 4foot tank sometime soon, and want to start collecting some rocks for it, not to use as substrate, but to make hiding places for fish. what kind of rocks are appropriate for an aquarium? and where can they be found? anyone in hamilton have a favourite place to collect them from? Doug

as soon as i can arrange transport for it from auckland, I havent confirmed with greg yet so its not made yet. I hope to do it within the next few weeks. :bounce: Doug

yeah I found this forum only last week. the auction sound like lots of fun. the people here are really friendly and helpfull, so I dotn feel too disapointed about missing the auction. Doug

Hi all I'm new to the forums and fishkeeping in general, have a small tank at the mo (way too small) and am seting up a new one, you can read about it here: http://www.fnzas.org.nz/fishroom/3-foot ... 14381.html I work alot and have other interests too, I hope to join the waikato fnzas club at some point. cant wait to start learning from you all Doug