Had it wedged into a corner at one point but when the cat goes on his late night swims or gets scared he managed to rip it off the ground, Strong fish. Kinda beasty. I see him push "haduken" waves around in there lol
Easy Solution if you want to keep the driftwood for the purpose of water softness then easy solution....ding ding .... Sump...place the driftwood in the sump. The cat will benefit more from the driftwood being in the tank than the stingray infact the stingray can hurt itself if the driftwood is in the tank there is a possibility of it scratching itself so my 2cents is no driftwood in your tank and if you'd like to soften your water going the natural route then I'd say go with the sump idea. other then that there are water softeners out there and you don't need the driftwood at all. GL.
Man u can start by filling the water up to the top, its Atleast 25-35% lower then the rim, that usually indicates the water hasn't been changed of refilled in some time, I'm not at all slamming you for what you choose to do but with that stock bi weekly wc are needed and by the looks of that evaporation id say its been 2 weeks minimum. Stress from bad water can do many weird things to fish not to mention much less water and space for the ray to swim in (basically shrinking ur footprint), imo start by maintaining it, that will help so much.
Wood is not going to break a tank, if you think it will get a bigger tank or like the others advised get rid of the cat. I commend your willingness to learn and listen so please don't take offense..
Go S. Vettel #1 rb8
Just get a reverse osmosis filter and reconstitute the water as soft or as hard as you want it.
A 1x per week 25% wc is nothing, that's 100% once a month, and with that stock Atleast double if not triple. I'm just saying the poor ray needs swimming space and that really takes it away from him, and I cannot believe you would have no lid with these fish even if of does get hot, u can DIY one urself, I use a metal wire shelf on both sides so they cant get out but its still opened for airflow. Man I'm just trying to help, a lot of people around here can tell u that, I want the best for your fish and when I see a pic like that I kinda cringe.....I'm not criticizing u, you could be the best fk ever for all I know, I'm just giving u advice from what I've seen and read here.....
You seem like a cool dude so ill leave it at that. 90% of the time u see tanks half full it was lazyness that's all. I'm glad u know ur max bio load and do wc according to your n03 levels that is however assuming you have 0ppm ammonia and nitrite.
Go S. Vettel #1 rb8