i went into nature and found a thing for the rats
it a rock
when they walk on it theyll grit their nails, and hopefully make their nails a lil less sharp
there's a ladder to get down as well as a rope perch but they often use this way to get down and it helps lessen the scratches! rats also like to use lava ledges as chew toys which is safe but sometimes ppl dont like to watch their money slowly or quickly deteriorate. to combat that problem simply file a complaint with your alpha rat and he should hold a group meeting letting the others know
jk just get more and hope they spread the lava ledge abuse
tl;dr... lava ledges and a rock are the real rat nail trimming MVPs










