I'm thinking about buying a 20g shallow off Craigslist, but they seller says there are dozens of these starfish everywhere. What are they? are they reef safe?
personally i just had bad experience with sand but to me there are some added benefits to a bare bottom especially your nano and spa tanks. It lets you keep high flow all around your even underneath them preventing detritus from settling also cleaning is so simple just siphon out the gunk on the bottom of your tank which is good at keeping your nitrates and phosphates down.Know more replacing sand is also a added bonus to the mix. If your worried about look this is my 2.5 pico bare bottom jus get some spray paint to the color "sand'' of your liking and from a far you won't even notice.
They do cause issues and tho it is sweet seeing little stars all over - if u are planning a reef long term in the end you will most likely not like these guys. It wouldnt keep me from buying the system but i would pull them out the best i ccould.I have seen them finish off zoas having probs that may have made it. There are many diff types it seems also as i have found at least 6 variations in the tank. I have also found one that messes with monti's (i will see if i can find the pic). I have even questioned on strain on sps - they eat off of problem areas with diff corals seeming to increase and make the problem worse.
Also it is a hit n miss on harliquins with these. Sometimes yes sometimes no but everytime not a suitable food source for them. I have had multiple and they are exactly what they are decorative and delicate. I have watched one of my male harliquins remove a 3" chocolate chip star from the glass and bring it back to his lady. He was the size of maybe a quarter - they ate on this for a good 5-7 days straight. So think of a diet consisting of only astera stars as one of us standing in super high winds eating only apples all day long.lol
Just some experience with them - mine and the wives fav specimens - and absolutely gorgeous. But they take a lot of time as far as live stock is concerned.