rabbut
I don't bite, all that often...
It's fine to run skimmerless, they are optional. Recomended though for a beginner, but optional all the same 


wonderin if theres diff species ofmantis or somethin which it could be!
or are there better things which would suit my tank better??? 
One things for shure, if it's predating crabs, it's a baddy and needs to come out 

If the hole isn't large enough to allow the thing in, carefully cut into the neck to widen the whole a bit more. Once done, fill with aquarium water and set it near the things hole
After that, all you can do is wait and set free anything you diden't want to catch, like say an un-suspecting cleaner/other shrimp...
lol
A mantis could then be sold on if it's one of a few species, as many want to keep them as pets. Other critters you may have to give away to a LFS or local with a sump, others are best euthanised 


Hi Everyone,
I have a Boyu TL450 (seems identical to the Orca TL450. I have a issue with temperature... its running at 28-30 C! with no heaters running. Has anyone had problems with heat in these tanks? I cannot seem to eliminate the problem? I have had the tank 4 days (so its just beginning to do its cycling thing) it is just because it's cycling? is this normal for a cycling tank?
Regards