I'm going to get heaters for all of my tanks when I have extra money. I have three 1G's, a 1.5G and the rest are 2.5G's. I've seen Hydor Mini heaters but some people have said that they only raise the temperature 4-6 degrees and I'd like to be able to set the temp to make sure that it stays at that temp and so it doesn't fry my fish. I've seen that some people have 25W ones that they really like. When I got my first betta I was told that they don't need filters or heaters
but I think it's time to get heaters. Any imput would be great! I know Walmart has the Hydor Mini heaters for $12 and I might get those for my 1Gs and the 25W ones for my 2.5Gs.