Mistakes
 
Majano Anemones - I first saw these in a fellow aquarist tank and thought... wow those look really nice they were green and had red spots on them and were only about the size of a dime so I persuaded him to scrap me 3 of them out of his tank.  Well I hurried home and put them into my tank hoping they would grow, well they disappeared at first but before I knew it my entire tank was infested with them.  My SPS corals were dieing faster than I could remove the anemones, they would propagate at the base of the SPS corals then slowly move up the branches killing as they went along.  As of right now (02/16/2008) I have mostly eradicated them thanks to a needle and lots of kalk paste, it seems injecting them directly with a concentrated kalk paste kills them 80% of the time, the other 20% split and multiply. Update 02-18-09 Wel Kalk paste ended up not working out they just kept splitting and multiplying, I also tried hot water it worked for a short time but not long enough. NOW I have a Racoon Butterfly and within a matter of 2 weeks I now have no more Majanos!!! Maybe one or 2 in a hole in the rock but other than that NOTHING. Success!!! So far *knock on wood* the butterfly has not bothered of my SPS that I can tell anyway.
 
Green Bubble Algae (Valonia) - This was another horrible outbreak I had thanks to lack of attention on my part.  They came into the tank on some frags and a few corals I purchase at the LFS's around town and I didn't think much of it at the time, however I think these little guys multiply faster than the Majano Anemones.  My first attempt at eradication was simply trying to scrape it off the rock and suck it out of the tank with a siphon hose, that worked to an extent but it was messy and they seemed to come back within a week.  My next attempt was a little costly but worked very well and was surprisingly easy!!! I purchase 25 green emerald crabs plus another 5 or 10 that were already in the tank.  At first nothing seemed to happen then it seems over night all the bubble algae was just gone and has not been back since, however those emerald crabs are still in the tank some of them are rather large now... maybe Ill make some Gumbo one day.