ur little bristenose wont eat itself to death so dont worry. I know it seems like they eat a lot, but you have to remember that cucumber is 96% water so they have to eat a fair bit of it to get their food. But this is good as this repicates their normal diet of algae which is also mostly water.
I never leave vegies in for more than 48 hrs but i normally try and have them out after 24 for things like cucumber. Other vegies I remove much faster. I take zucchni out after only about 8hrs as i find it fouls the filters in my tanks. If i have blanched the vegies i remove them much sooner too as they seem to break down and cause bacterial blooms much faster.
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