Well that is good news.
For future reference a 40 gallon is on the small side for bala sharks, an adult needs a 5-6 ft tank for them to have proper swimming room. Also they are a schooling fish ^^.
The bichers should be fine for your tank, but make sure you know what species you get, some species can get at least 2 feet.
The pictus cat should be fine in your tank, as long as its not a 40 tall tank. Still try to figure out the other catfish.
Sorry about your losses, but I am glad you want your fish to be happy/healthy.
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