Yes. One can strike a long-term balance between nutrient addition (fishfood) versus nutrient removal (plant pruning, debris removal, etc).Father Fish claims that with his method, water changes are never needed. Can this be achieved with the Walstad Method as well?
I interpreted this as a prophylactic measure. Namely, against ich which makes sense especially when keeping tropical fish.Father Fish is an interesting fella, isn't he? I was struck by how he says to keep tanks at 80 deg. And I was just reading somewhere the other day that we're keeping our tanks too warm!
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I tend to agree with you. If I'm not mistaken, all natural freshwater bodies have runoff and fresh input of some sort. Natural water changes!I tried the no water change thing and it's never optimal for the fishes. Sure plants or deep substrates can eliminate nitrates but there are other waste products that compromise fishes immunity.
I have experienced the same. What we're doing is probably giving them extra electrolytes, electrolytes the fish have consumed by merit of, well, being alive. Additionally, with the aggressive plant growth, I struggle to keep nitrates above 10 PPM and they also consume electrolytes. So a top up or partial water change gives them much needed chlorides & phosphates & carbonates of potassium, calcium, magnesium and sodium. Sugars & sulfates come from food so a freshening up is needed every once in a while unless you want to dose Seachem Replenish at regular intervals.I can go many weeks without water changes and my water parameters will stay within safe ranges. But when I do a nice water change anyway, my fish all seem to liven up and have renewed vigor. So I may not technically NEED a water change, but I do it anyway. The fish seem to appreciate it.