The new ferns seem to be doing okay. I have a couple that are more vigorous, but they are different varieties so the differences in growth are easily explained.
The gutter fern is a delicate thing when compared to the stems of the Hawaiian begonia (Ricinifolia Immense). The stems of that particular begonia grow to be bigger around than my thumb. The other two ferns aren’t as big as my original wood fern, but they’ve just gotten started.