water levels

I noticed in my main display tank the water levels drops and rises through out the day. More so when its warmer/higher humidity the water level drops. Cooler temps the water level rises. It appears this way any how. I did some googling and didn't find anything. Is this a normal thing has anyone...

So I have a 32 Gal Fluval Flex that has been running for about 9 months now. Recently, I had a couple Zoas and a GSP that have been closed up for a few days so I decided to test my water. The results were: Ammonia: 0.0 Nitrite: 0.0 Nitrate 0.0 (checked twice w Hanna checker) Phosphate:0.37...

I'm having issues with a DIY sump build on my AIO tank and I'm not sure if it's a non-fixable issue or just something that needs more time and patience. As my tank is in a corner pictures of the back are hard to get, so I hope this MS Paint masterpiece is clear enough. (not to scale, and...