Keeping the water clean is very important . Bad things happen when the water gets dirty. Keeping everything clean is important. It's common to hear things like parasites are natural , animals in the wild aren't bothered by them etc. In the wild animals don't control parasites on their own. There are a number of limiting factors including the animals contracting parasites that eat parasites. Natural de-wormers . What ever you can do to help keep things clean is good. I think you know this already. From reading what you've been saying you probably have more game then a lot of the "experienced" guys.
For some reason people are very interested in how others spend their time and money . They love to tell people what they don't need. I understand the concept of over kill I know how little you can provide and have the animals live long / produce what ever but I also think that if a keeper wants to the extra mile. Do it.
( fake rock walls inside the building with little waterfall jungle pools )
I did a couple set ups like these for a nature park . Looked good and the lizards seem to like it. I went the simple route. I put a drain in the pond and hooked the water fall to a line. The water ran during park hours and was turned off at night. Moving water encourages drinking .Some people put air stones in the water bowls to increase the humidity I always did it because it helped to get some animals to drink.
It's true dehydrated lizards defecate in their water bowls it's also true that perfectly healthy monitors do this. It's very common in reptiles . Overall how do your lizards look and act ? Bright eyes, feeding like pigs , active ? Doing lizard stuff? A good friend on mine likes to say ,
Their your animals , you clean them , feed them, breed them, you know them.
Ernie Eison
WESTWOOD ACRES REPTILE FARM INC.