Interesting. I've never seen clear gel...usually just an empty casing. Don't really know what to tell you on something I've never seen myself. If ammonia isn't being affected you could observe. If ammonia is being affected, then take it out.
, having a tank without media really dampens the amount of bio in the system. The substrate hold at least half the amount of bio a system can cultivate to maintain water quality. A ten gallon water change in a 35 is taking out a third of the tank each time and that can lead to stress. Marine animals are not adapted to withsatand sudden changes within their environments. Stability becomes very important in a closed system, which is the aquarium.
Get some substrate in there...perhaps at least 2" of aragonite topped with live sand. If you do 4" or more, you could cultivate denitrafying bacteria to control nitrates biologically...instead of vacuuming the bottom. In fact vacuuming is eliminated with a deep sand bed. Still need to do water changes, no more vacuuming. Without a substrate of anykind, your system may not be able to stay stable nor support what you want it to support because of the lack of bio space. Nitrates can easily get out of control without a substrate. With a DSB
, the bristleworms actually become even more beneficial because they keep the substrate clean and turned. Critters moving within the sandbed releases gases taht build up and allows it to dissipate intot he atmosphere. The system gets a chance to experience a fully biological nitrogen cycle.
We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.
The oceans surely would swallow us before a rock comes down to smite the planet of it's life.