It's looking good. Congratulations on a nice job. I have a couple of tanks with deep water (6 to 12 inches in a palludarium) and have never had a drowning. Darts can swim rather well, and as long as they have an easy egress to land, it's no problem. I've seen both galacs and imitators swim quite efficiently when they either dove or fell in the deep water accidentally. With frog fights, they will separate if they land in deep water. I think the reported drownings have all occurred when a bully frog has held another under in more shallow water where it can obtain a purchase, but don't know for sure, since none of the reports I've read has ever been a first hand experience by the reporter--only anecdotal warnings that tincs in particular may drown each other. Darts can actually totally submerge for an incredibly long time, although they seldom seem to do this deliberately unless frightened and hiding under something. Someone has reported that they have a leuc that submerges for up to 15 minutes at a time for no apparent reason. In any event, 1/2 inch isn't too deep.
Several of my frogs-- the casts, fantasticus, reticulatus and P. vittatus in particular, spend a lot of their time sitting under rocks in the shallow pools and waterways, and behind the waterfalls, where I assume they can still breathe perfectly well.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus
2 D. azureus
4 P vittatus