due to brew vermicompost tea(oxcygen used) there are some microbes that they build coral like. are there anybody know about and its good or bad one. thx.
That looks a lot like fungi growing nicely, it is possible the color variance is caused by "contamination" (in this case it would be several fungi competing for the same nutrients in the same spot). Since you are oxygenating the tea, it will be unlikely that you grow any "bad" microorganisms, most of the undesirable microbes are anaerobic not aerobic. You could, should you want to, take a sample of the fungi and grow it out in a sterile medium, that way you can get a look at a non contaminated sample, which will help in identification.