I just looked over at my tank and realised that the gap still hasn’t opened, and the hammer has just closed. I put the GSP on the wall about 8 hours ago, and I moved the hammer to slightly higher up in the tank about 8 hours ago. The GSP opened fine when it was in thr sand bed on thr frag plug, and the hammer opened up fine for the last 7 hours, it’s just in this last hour it’s closed. Anyone know why GSP won’t open and why hammer has just randomly closed .