help please

[Bloodasp]

That's really gross. Sorry for what they did to you, not just your tank. I am with kien hoping it's just pee. I am betting that you can still reuse most of your stuff, probably wash some of your hardware pretty well and replace as much of the water as you could. And do probably more water changes than normal just to get whatever is still in the sand and rocks out. I just hope none of your livestock died due to this.