Hey there again. My 1.7 year old male Opaline Gourami I've had in with several different fish and he has always been very sweet and gentle. A couple weeks ago he got an injury on his tail and he's now fully recovered, about a solid week. But yesterday after I fed the tank, he started some aggression! He has kept up being mean and chasing off his Platy tank mates today. He's never been mean, not even to tiny fry, always calm and using his feelers[pectoral fins] and just meandering around. But now he darts and chaises everyone away. Only new thing in his tank is a 12in bubble wand. It almost seems like he is protecting them. I've just this moment realized this. I don't know, is it because he thinks they are eggs or a bubble nest?? I'm planing an upgrade in tanks soon. But wondering if it's stressful or detrimental to his health to be so uptight and grumpy over the bubbles.