I am new to this site but just thought I would make a comment about Vibrant. I had a big gha problem and after trying all the usual things I came across vibrant. I have used it for 4 weeks and it has got rid of the algae 95% which is brilliant. But in those 4 weeks I have lost a blue starfish, tuxedo urchin, large emerald crab and a very large teddy bear crab. So I am overall pretty disappointed and will stop using it and hope the gha does not return!