My own personal opinion, I really refrain from bleach around animals. I don't even use it as a cleaning product in my house. I use more natural cleaning aids, most of which can be found around the house. White vinegar and water solution (about the same ration as your bleach to water) does the same job and vinegar is non-toxin. If you have the earth safe soap, you can add a tiny drop of that to your water:vinegar solution as well. Another good, non-toxic and natural, way to clean is to put ice in the bottom of the tank with some salt and then you cut up lemons, squeeze the juice into the container over the ice and salt mixture. This works great for cleaning glass, not so good for plastic! The ice and salt mixture act as an abrasive and the lemon acts as a cleaner. Also, you can sprinkle in a little bit of baking soda on first- the alkaline quality will help to absorb the toxins AND this is a great combination if your aquarium glass get foggy from calcium build up. I have cleaned my quarantine tank like this for quite awhile now and recently started using my quarantine tank as a cricket keeper and my crickets are doing great! In fact, my loss ratio, since I have converted them over to this tank, is a lot better! Before half my crickets were dying and now only one or two. It's also because of the habitat that I have for the crickets too, even they have a sweet living condition!

I hope this helps.