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GH & Molt issues For the past few weeks , I’ve been experience a number of death in my system. My system consists of 1 x 3ft tank, divided into 3 sections all with individual bulkheads water return & 5 x 2ft tanks all plumbed to a 3ft sump. WP test results DATE TDS PH Amm…. NITRITE NITRATE KH GH Ca 15/8/15 185 6.4 0 0 10 0-1 8 45 7/9/15 180 604 0 0 5 0-1 8 40 Around the 27th to 31st August 2015, I add another 5 x 2ft tanks, plumbed into the system. These tanks were cycled over 4 weeks. All tanks in the system were setup with Benibachi soil, mineral powder & beemax. DATE TDS PH Amm…. NITRITE NITRATE KH GH Ca 31/7/15 170 5.4 0 0 5-20 N/A N/A N/A I add 1 tank at a time to the system over 48 hours, then another and so on for the next 10 days. DATE TDS PH Amm… NITRITE NITRATE KH GH Ca 9/9/15 9AM 185 6.4 0 0 5 8 1 50 9/9/15 1PM 170 6.2 N/A N/A N/A 7 1 35 ?? 21/9/15 167 6.2 N/A N/A 5 7 0-1 45 23/9/15 165 5.8 0 0 5 8 0-1 45 With the drop in PH record today, I decided to tested each section of the system SECTION TDS PH Amm NITRITE NITRATE KH GH Ca SUMP 164 5.8 N/A N/A N/A 0-1 8 45 3FT TANK 167 5.8 N/A N/A N/A 0-1 7 40 TOP RACK 167 5.8 N/A N/A N/A 0-1 7 40 BOTTOM RACK 165 5.8 N/A N/A N/A 0-1 8 45 From the results, both the sump & recently add bottom rack have a higher GH & Ca and have lowered the overall systems PH. I took 2-3 different test for GH , Ca to ensure accurate results. Temperature ranged from 22.8-23.6 degrees I used Salifert for Ca test & API for GH & KH. Ph is with an ATC pH pen which I calibrated before testing today. Yesterday, I found 2 dead shrimp & observed the reminds of a failed molt, that had part the new exoskeletons from a CRS attached. Today I found 2 dead shrimp. Over the past 2 weeks I noticed a few berried girls, its been over 2 months since I’ve had any berried girls. So do I continual to lower the GH with a goal of 6 & TDS 140-150 or just allow the system to reach its own equilibrium?? Cheers,