Hi Kapo,
When i say tank water, i mean rain water tanks, as our town water is really quite terrible. I will have to test the ph and for nitrates, and i will post the results tomorrow, as i need more ph tester, and will have to purchase tomorrow.
My tank is quite large 102cm by 51cm and then also quite deep 60cm although i don't always fill to the top usually 3/4 or less.
I do have light source, (mostly for the plants) but i have 3 large hide hide spots for them, and i only put the light on for 3 hrs for the plants sake.
I spot clean a few hours after every feed or when i notice faeces in the water, i top up the water after i spot clean as i use a siphon. I feed every 2 - 3 days. I do a 1/3 water change every week, or sooner if the water if needed.
I have insolated Maddy and will monitor the other axies carefully, but the very first 2 i bought have never had any problems with tank water, other than fungus, which lasted only 2 days, as i treated them with salt, and has not reoccured since, and i have been vigilant with keeping the tank clean.
the temp of big tank is 18 degrees.
Thank you for your time and patience.