Agree with the keeping in a completely different room provides a much safer barrier not necessarily from splash, but accidently using the wrong piece of equipment in the other tank. If you are set on it being closer I would make sure to get some type of tape and color code ALL of your stuff that goes in the water- pipettes, nets, containers, airline, everything and anything. Depending on how you test salinity that even needs considered! The thing about having it in another room is you have to actively think about going to get something from the other tank so you won't easily pick something up without thinking about contaminating it and place it back to use on the DT. One drop of water can completely ruin everything you have just taken time to do. (I didn't realize how easy it would be to pick something up without thinking about it until I started using the TTM because those tanks are right beside one another until the flip happens and that little bit of time where one set of things is right there within reach can easily cause every step taken before to be void)
