Join Date: Mar 2009
Location: Albuquerque, NM
I have been doing a fishless cycle in my 90g tank for the past 3 weeks and everything seems to have gone well. I've been adding ammonia and regularly and am now reading:
ammonia = 0
nitrite = 0
nitrate = 0
kh = 35(drops)
gh = 0 (Could my test kits be wrong?)
The nitrates were up to 10 ppm but have gone done to 0 I think because of the tank being really heavily planted from the start. I will start to fertilize using the EI method today.
I am wondering why the pH on this tank seems to be rising. I am just using tap water which has a pH of 7.4. After doing a 75% water change
yesterday my tank was reading 7.6 and this morning it is up to 8.0. I will be running pressurized CO2 on this tank that will bring the pH down but I was wondering what could be making it rise like this. I know that some think that pH is not that important (as long as no sudden changes for the fish) but was wondering if I have something else going on in the tank that I should know about.
I was running the CO2 up pretty high (DC was yellow) and the pH also rose while the CO2 levels where rising (based on DC color).
Should I stop using my tap water (pH = 7.4, Kh = 35 gh=0), add minerals, RO or what? It seems like the water is too soft (gh) for it to be healthy for my plants.
Thanks for your help?