Does not matter the rack whether you built it or you buy it, if you have a watering system you will have a flood sooner or later.
I had one within days due to a faulty valve it happens.
Does it happen a lot in normal circumstances? General not in a decade I might have had 5 or 6 flood, the key is to inspect your valve each week simply by letting your finger run underneath each of them. Make sure they don't pack bedding up in the valve and once a year clean your valve with vinegar and flush your lines. And make a daily check on your animals if you can.
You drill holes feeder will find them and use them as a start to chew their tubs.
Using a 1 gallon tank defeat the purpose of making it easier as a keeper.
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