Hi, two things about your post that jump out at me, may or maynot be causing the issue;
1. is that you have doubled your tank size, but not your lighting, so you've cut their light by half.
2. Has your alk always been at 7? seems a tad low to me, and out of balance with your calcium.
sure hope it's not an stn event, and that it turns around for you.
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