NimbleWalrus

I'm looking for a bottom dwelling oddball(s) for my mostly SE Asia themed 75. Currently stocking up the tank with Denison, Odessa and Snakeskin barbs, a trio of SAE, a single leopard bush fish (Ctenopoma acutirostre), and a small group of mirolepis archers. I'm thinking the tank could do with a bit of focus on the bottom, and I'd like something that'll share attention with the archers. Much appreciated!

I see no reason not to. Manilas are a saltwater clam, but I can't imagine the tiny amount of saltwater in their body will negatively impact your tank. At most all I'd think you need to do is crack the shells on the clams, but that may not even be necessary. Your puffers will know a good meal when they see it and shouldn't have any trouble getting into them.