Big Surprise in The Bug Tank — Ruth Horowitz

Readers first met Sam and Leo on the trail of a runaway roach in "Breakout at the Bug Lab, " "a book where everything is just right" ("School Library Journal, " starred review).
This time the brothers' giant roaches aren't running, they're multiplying Can nutty ideas, a bug bet, and a little science solve the population explosion? Both bug fans and the bug-squeamish will have a rousing good time with this funny, clever, action-packed tale that's just right for encouraging independent reading.