The frogspawn, like the hammer and torch, should have nice long, extended tentacles. Actually a healthy frogspawn, that has proper flow and lighting will have its tentacles extended so much that you won't see its skeleton. Pretty cool looking. They are pretty hardy and as long as he isn't being blasted he should be ok and adapt. In the wild they live in anything from bright, clear shallow water with pretty high current to dark, murky water with very little current.