I have a 150 gallon paludarium set up that i am having issues with. the tank is filled to roughly one hundred gallons with a corner of as land area. I created the land using egg crate, great stuff pond foam, silicone, cocofiber as I have seen a lot of people do. That said something is causing the water to to be toxic or something. All my water tests came up good but so after cycling the tank I added a pair of true freshwater archers. They did fine for a bout 24 hours then I came back to them dead and the dither fish in the tank seemingly struggling as well. I cannot figure out what is causing the problem and was hoping someone would have an idea what could have killed the fish as from all my research it seems like my set up should be fine. The tank is filter with a Aquatop cf-500