I got a baby betta, Charlie, from Petco about a month and a half ago. The past 2-3 weeks I have really noticed a color change and bigger fins. But he definitely isn't done growing yet. Today I went to change his water and I noticed what looked like a bubble nest forming near his filter (I'm positive the bubbles aren't from the filter). They were really tiny little bubbles all formed together into a decent sized blob of bubbles. Could it be a bubble nest? I don't think he's quite grown enough for him to be mature yet. Can anyone give me some insight?