Another note ... I've been using a Conductivity Meter to measure water hardness. It measures in MicroSiemens, that I've been converting to dH (German Hardness), which over the years had measured 15-19 degrees. This is in the range for Cichlids (Moderately Hard). Although, today I got curious and researched what the MicroSiemens should be for Lake Tanganyika and it looks like it should be 606-700. This was great news, since my meter is running 615-620 for both the 125g and 29g. Does anyone else use a Conductivity Meter for a Tanganyika tank?