If you had an algae bloom it was because you added too many BPs at once. BPs are a carbon source for bacteria. You need to find the balance where the algae can grow, but not take over. That really bad algae bloom can wipe out your tank, if the algae grows really quickly it will suck out all the oxygen from your water. I did the same thing with vodka once. In the morning i had a few dead shrimp and my fish did not look happy. I dont know why so many people LOVE BPs, just run vodka. Its safer and easier IMO...Plus it literally does the EXACT same thing.