my tank has been running at 26C for about 2-3 weeks and one of my newts has got a problem from water quality, because of high temp and food fouling, and also i have go a small amount of white mould on bottom too, is there a max temp for a low tech tank?
Only the same effect temperature will have on any tanking system so based on using soils alone I would say no. My tanks routinely run for months with the temps at 80 - 82°F.
something else is in play
The Fraternity of Dirt
If at first you don't succeed,,, keep kicking it RubberSideDownOnTheLanding, 2-75g planted, 5-55g planted, 5-20g planted, 110g w/30g sump, 8-10g, Refugium, doghouse/newbie 2012 update adding table top pleco pans & a 90g (Nutz)