These fish lay non-adhesive eggs which are scattered around as they spawn. I've never seen them come out as a clump like this and am also inclined to suspect a parasite of some sort. You should isolate this fish to a quarantine tank and see what develops. Parasites don't normally kill their usual host so your fish may well survive this once the parasite has completely removed itself from the fish.A few weeks one of my Black Skirted Tetra's belly got really big. I thought she was either really full or bearing eggs. Now I see her with this long white clump coming out. Is this a clump of eggs?