02-01-2006, 01:55 PM
Join Date: Jun 2005
iTrader Positive Rating: 100%
I've never owned Rummy Nose Tetras before, but let's take the delicate Neon Tetra for example. A normal complaint is you buy a dozen and only a couple are still alive after 2 weeks. This is probably due to lack of acclimation. In your case, you probably acclimated the fish to your tank's water when you got them, but the large water change soon after acclimation probably shocked their systems.
I acclimated a 3 month old Neon Tetra (that I raised from an egg) to my upstairs hi-tech planted tank's water about a month ago. The Neon came from RO water. Since I only do water changes every other week on this tank, the Neon probably had several days to get used to the water before the next water change. I don't do anything out of the ordinary when doing water changes on this tank now that the newly acclimated Neon lives here. What is an ordinary water change for me? The water is 30%, dechlorinated, & the temp is measured to match the tank's temp.
I agree with Damon that a waiting period between acclimation and the next water change should take place and the temp of the new water should match the temp of the water in the tank. This should avoid major early swings in water parameters.
If Pete's water has a pH of 7.7 and your planted tank has CO2 injected, then your water is most probably on the acidic side, 6.something (that's my educated guess with Ohio tap water). A pH swing of 1.0 could be enough harm Tetras. If this is true, your fish may have gone from alkaline water (Pete's water) to acidic (CO2 injected) then back to alkaline (post tap water change) after the 50% water change then back to acidic after the CO2 dropped the pH back to the level it was before. Not to mention tap water has a higher pH straight out of the tap than it does if it sits a day or two. Also, my pH controller only fluctuates about .2-.3 before kicking on again. Even at night when the CO2 is off, it still only goes up .2-.3.
The point I'm trying to make is these fish have been on a rollercoaster ride of water quality!
Since I will be breeding at least 5 different species of Tetras this year, I hope to master the RO to tap water acclimation concept. One step further, all of the Tetras will be going into my hi-tech planted tanks only. I hope to be of more use in the not so distant future.