Sounds like your monitor needs a whole new environment.
Aquariums are not suitable caging for most monitors, and with the dwarf species that they can be used with, the aquarium needs adapted to make it useful to them. First almost all aquariums (of any size) are too narrow, too short, too shallow. Its is alot easier to build a suitable cage from the start with plywood, FRP, adhesive, plexiglas, etc.
The cage needs depth (for dwarfs about a foot is good, the more the better). They need a range of temperatures and humidities, this is accomplished with the light being on one far end and deep useable substrate such as dirt. The temps should range from around room temperature (68f) to around 90f (ambient or air temps). If there is enough space and substrate depth the humidity will almost regulate itself.
The basking temps (very important) have to be around 130f and much higher with some monitors (some like it higher). Accomplish this with a low watt flood bulb mounted about 6-12 inches from the basking surface (plywood works great).
Niloticus are semi-aquatic, they need to be able to swim, but can make due with water to soak. These are not handling lizards, they need privacy, and are afraid of humans, they are famous for biting and scratching wildly (normal for this species).
They normally will eat like bottomless pits when healthy. Adapting an aquarium requires a solid top (dig a ditch and bury the screen top, they kill more reptiles in captivity than almost anything else). Screen tops on aquariums create conditions like an electric dehydrator or jerky machine (convection). Simple test, place a piece of meat in the cage as set up, check it at the end of the day, if jerky, it tells you that your lizard is suffering the same fate but slower, if it sits and stays moist it shows that the cage holds humidity.
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