NOPE 100% of my XRP is there earning interest daily(for months now). Keep the test batch there until you feel better about moving it all there. Nexo earns their money by loaning $$$ on fully collateralized deposits. I don't borrow there, but would if I needed funds.
I did the same thing but ended up moving ALL of my XRP there a couple of months ago and haven’t had an issue since. Plus 4% interest on the number of XRP you hold there on a daily basis. 2 thumbs up from me!