As far as the tape goes I've always used Scotch's brown colored packing tape. If you put it on a smooth clean surface like plastic boxes it lays down super flat and the edges never peel up. I've used it for a few years and never had a issue.
J the problem with the jugs your using is although you might paint the sides, it's like they are still in the open because theirs no top to help them feel secure once you cut off the top half. I'm sure you probably give them something deep enough to burrow down in but until they do that or anytime they stick their head out of the substrate they likely feel exposed.
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Randy Whittington

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