I have to completely disagree with Amano on this one. A substrate does not run out, nutrients in a decent substrate with a high CEC will be constantly replenished. I have one tank with a 7 plus year old substrate, the only thing I have ever done with it is add root tabs (iron) and it's as healthy and vital as it was when it first matured. I dose according to the EI method, algae is not a problem, the fish are as healthy as any I've seen and the plants require weekly pruning. Maybe his substrates run out, but mine certainly haven't and quite frankly, I've never heard such an idea before. ----- Original Message ----- From: "Livay Aviel-R51374" <Aviel.Livay@freescale.com> To: <aga-member@thekrib.com> Sent: Tuesday, July 12, 2005 12:20 AM Subject: [AGA-Member] Possibilities of Sozo Haishoku > Hi all, > > In the last TAG I enjoyed reading Takashi Amano's article "Possibilities of Sozo Haishoku". It was actually interesting to know that this guy actually battles algae on a daily basis.... :-) > > But one thing that he said is "news" for me - He said that there's a time limit for an aquarium and at some point one has to replace the substrate and "renew" the tank. I thought that a reasonable substrate runs out of nutrients (except iron) in about a year or so however it should still absorb some nutrients from the water and my impression was that water column is the king as far as fertilization so no need to care so much about substrate anyway. > > Am I missing something? > > Aviel. > > _______________________________________________ > AGA-Member mailing list > AGA-Member@thekrib.com > http://lists.thekrib.com/mailman/listinfo/aga-member > _______________________________________________ AGA-Member mailing list AGA-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/aga-member