Hi everyone, I've noticed that one of my mollies occasionally had what looks like a bit of foam coming out of her gills. The tank is 20gal and we've had it set up since January. There are 3 other black mollies with her (one is a baby that was born a couple months ago), an algae eater and 5 guppies (one of which is also a new baby from about 3mths ago). I change about 25 to 30% of what water weekly, and change the filter bi-weekly. I use "easy care" and an aquarium conditioner with each water change. I have also started adding aquarium salt with the water change. The Molly seems healthy. It just randomly will have what looks like foam coming from her gills. I happened the first time a couple weeks ago, but then nothing for about 4 or 5 days. I check her each day and it just seems to be a random thing. Her behaviour hasn't changed at all, she still swims around and eats as she always has. Is the random 'foam' something that I need to treat?? Any help would be appreciated. I haven't been able to get any clear pictures of it. But will keep trying and add them. Thanks!