Reef Builders - The Source for Reef Keeping Information

hi, i haven't been marine keeping for very long and im getting some hectic things growing in my tank. i have these massive green bubble things appearing all over the place are they a good or bad thing? i have noticed that one or two have popped dont know if this will affect the water. i also have this red plant growing is that also a type of algae it has yellow spots when just under the marine blue. and finally i have loadsa grass like fur growing on my LR's how can this be kept to a minimum because...