In my experience no tank reaches a point of stability. People used to refer to this state as old tank syndrome. The assumption was that the fish had adapted to the mess and new fish would die from the chemistry if introduced. I don’t think that is too far from the truth. I’ve neglected enough tanks over the years to know that eventually things go downhill.
I’ve often kept tanks with simple 20% water changes once a month. More would probably be better but I would consider that a minimum. I’ve never used CO2 and I very rarely fertilize. Most plants will not thrive in those conditions. Though there are enough that will do okay and look quite impressive if one is not entering contests. Fish food is a very good additive, essentially a complete fertilizer.
The lights I use are typically considered low light. For the past several years I have mostly been using the spiral florescent bulbs. I find these to provide plenty of light or most plants, though I don’t have any tanks larger than 29g.
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