It is both good and bad ShadowedSin. It means that your ammonia eating bacteria are becoming established and it also means that you are not changing nearly enough water to keep your guppies alive and healthy. It is one thing to treat them as sacrificial, something I won't do, but it is another to lose them before the end of the cycle and lose the small amount of ammonia that they are providing.
I use rain water in my tanks and can tell you that you need some tap water if you don't want the water to kill the fish. My rain water has total dissolved solids of less than 10 ppm which is even lower than what I see from my RO. Your choices are to to add in minerals by mixing the rain water with tap water or to add it in by mixing in a chemical mix designed for people who use straight RO water. There is a product called RO Right that is meant to be used that way but I only bought it once before I figured out that the minerals my RO took out could be blended back in by using some tap water.
Your 107 ppm is only about 5 or 6 degrees of hardness so it is already fairly soft in terms of KH. The problem that I see with what you are doing is that to lower the KH, you are raising the TDS through the roof by adding chemicals. If you are going to try to do "soft water" fish, stop adding to your TDS to get there. Soft water fish like their water low in TDS, we call the water soft but what they really need is low mineral content. That can be accomplished much better by diluting the tank water with RO or rain water than by adding things to the water. The only way adding can help is if it causes the natural minerals in the water to precipitate and thus leaves behind lower TDS water. I don't know of aquarium chemicals made to cause that to happen although it is something practiced by water companies who start with extremely high TDS water.
I use rain water in my tanks and can tell you that you need some tap water if you don't want the water to kill the fish. My rain water has total dissolved solids of less than 10 ppm which is even lower than what I see from my RO. Your choices are to to add in minerals by mixing the rain water with tap water or to add it in by mixing in a chemical mix designed for people who use straight RO water. There is a product called RO Right that is meant to be used that way but I only bought it once before I figured out that the minerals my RO took out could be blended back in by using some tap water.
Your 107 ppm is only about 5 or 6 degrees of hardness so it is already fairly soft in terms of KH. The problem that I see with what you are doing is that to lower the KH, you are raising the TDS through the roof by adding chemicals. If you are going to try to do "soft water" fish, stop adding to your TDS to get there. Soft water fish like their water low in TDS, we call the water soft but what they really need is low mineral content. That can be accomplished much better by diluting the tank water with RO or rain water than by adding things to the water. The only way adding can help is if it causes the natural minerals in the water to precipitate and thus leaves behind lower TDS water. I don't know of aquarium chemicals made to cause that to happen although it is something practiced by water companies who start with extremely high TDS water.
