help with temperature

[mseepman]

Yes, it did...and with a faulty thermometer I didn't realize it had. I just noticed that when I put my hand in the water for feeding my Sun-Coral that it seemed cool. I thought it might be just my mind but I still looked at the temperature and it read 77 which is close to the 78 that I've always kept it at. I was still suspicious so I grabbed a hand-held one and dipped it in to get a very low reading of about 67. I went to the LFS and grabbed a cheapy coralife and stuck it in to get a new reading of 68. I bought a new Ebo-Jager 200W heater and have slowly been bringing it up (today it's up to 70) but I wasn't sure this was the right thing to do? Is this too fast, too slow?

In reality, is the 78 I usually have right?