Is it legal to kill someone because they messed with your tank? My idiot brother (who is 31 and should know better) dropped a whole algae tab about the size of a nickel into my TWO GALLON tank to try and make my crab come out to eat. He didn't tell me about it and I discovered it about five hours later. Fished it out in pieces and did a 25 percent water change--luckily I've been keeping water premixed for just such an emergency...maybe not this EXACT one though.. I'm wondering how long it would take to show a nitrite spike if this hurt the tank? I tested today and had zero nitrite reading. Any help would be appreciated, either with advice or in removing my hands from around my brother's throat. Just kidding. I did make up a few new cuss words and left them on his answering machine, tho