My fantail guppy has been lying on the tank floor, not eating or swimming, and I'm really worried. My other two fish, both zebra danios, are fine, but the guppy isn't! Can I put a plastic water bottle in the tank to cool the temps? It's really hot where I am so the temps are high too. They're still in the 'safe zone' but it's still higher than normal. HELP PLEASE!
realisticly you should have a chiller. fish cant regulate their body temperature so you have to be careful, id suggest instead of your water bottle idea that you do a 20% water change with cold water. the only thing is you have to add the water extremly slowly. and maybe only do a bit at a time. if you do the water bottle idea be sure you have really good circulation. otherwise the area by the bottle will be really cold and the rest of the tank hot.
You can put a bottle of cold water in a tank, as long as it's not completely full. About half full should do it. And make sure the cold water isn't any more than one to three degrees cooler than the rest of the tank; it could shock the fish too much to have any greater difference than that.
Fill a water bottle with water but not too full and freeze it then float it in the tank but do not open it
