So I'm pretty upset right now, but I think my a. aculeatus is on death's door. I got him early November, so not very long ago. But in the last week he's shown some odd behavior. First day, (late at night) he randomly decided he was scared of my hand and inked when I tried to feed him (never done that before). So I ddecidd to do a water change early morning. Checkled levels since, everything that should be is at 0. Ever since then he's been hiding more, showing loss in personality and interest in anything (like not bobbing his eyes when I come in the room, or changing speckled like he usually does for feeding time). And the last 2 days he's been really weak, instead of swimming off of the glass to the rocks, it looks more like a fall-then-float to the rocks. Is this inevitable, or is there something I'm not doing right and can change?