I have a 19.845L tank, that's I think 5 gallons.
It's heated at 28*C/82.4*F
I have two live plants in there in good condition.
The tank is unfiltered so I do one full water change and cleaning once per week without fail.
Each time I do the change I use water prep tablets then one scoop of mineral salts.
I'd have to guess my fish is pretty happy but I notice that he doesn't like to make his bubble nest until around the time I'm getting ready to change the water.
At that time sometimes the gravel has minute amounts of algae but generally the tank is still clean.
Can he go maybe 2 weeks at a time? When he starts to make the nest is the water the right perhaps the kind of natural dirtyness he'd live in in nature? Or even though he's happily making his nest is it possible the water is becoming dangerously unlivable?
I'm just a bit of a 'naturalist' and figure if he's happy making a nest why change the water?
But then that doesn't mean you want to wait till he's suffering to change the water either, so if 1 week is still the most optimal and safest route that's fine.
I read something about partial water changes but I think that was for filtered tanks?
Thanks for any advice