So I have a tank filled with hammers. A couple months ago one of my hammers looked really weird and closed up but was still open a little bit. It has stayed like that for roughly 2 months. Now a second hammers is doing it and a third looks like it might start soon. Any help would be greatly appreciated. It happened to the green and purple first. Then the purple. Now my yellow is looking like it might close. But I have 10 other hammers that are completely fine.