One crab, can really cause a lot of chaos.Also i got that naughty crab in sump jail as 3 times caught it trying to kill the smaller 2 inch conch and conch was hiding under sand very often and not doing its job and hermit digging it up and caught it once trying to dig a nasarius snail up when found snails breather tube sticking up from sand and snail going deeper and deeper then dissapeared under sand and apoeared above sand 5 inches away then zoomed off but now im feeling sorry for the naughty hermit as he on his own in sump and its bare glass bottom with couple rocks in skimmer section and few rocks in return pump section but no light at all and even made him some little steps out of eggcrate so he can get over the glass in one section to the other and he struggling to walk on the glass and often see him upside down struggling to right himself so thinking to put some larger pieces of crushed coral or sand in there but then skimmer be sat on it and just be harder to clean sump as slower flow than dt so detritus gets in sand etc.
Edit: added pics of steps made out eggcrate and weighted down with sones with elastic band at ends ha ha and eggcrate so can climb up rocks then rggracte for last bit but he just stays in skimmer section,maybe return pump he doesnt like so not sure what to do over 1 little hermit crab lol.
As my soft side saying buy light for sump and put sand down and maybe even start growing some macro algae and have some kind refugium with sand and stuff for him lol.
But would need take skimmer out sumo and hamg it on side like how it can be when system designed as bought it all ready to go with all equipment ( stock)
Even think i should put few hermits down with him but he nauggty so could try kill them which cant blame him as thats how they act in wild.as got to kill there meals most of time or if opportunity presents itself ^_^