weird bubble?

What should I do then?

 

Pray it doesn't spread. Manual removal is the best way but this is a tricky thing as you want to avoid popping the bubbles and spreading the spores. The best way of doing it is in conjunction with a WC. You can get a piece of rigid airline tubing like the kind used for undergravel filters. Cut it at an angle.Attach a piece of flexible airline to the end and start a siphon into a bucket. Then gently use the rigid tube to pry off the bubbles. The siphon should pull out any spores if you happen to burst a bubble.Good luck.

 

Will give it a try..thanks for the advice