My 150W Aqueon Pro heater seems to be on the fritz in my 26G tank. It's been working fine for the last two years and then all of a sudden the unit shows that the water is at the set temperature (78º), even though it's actually testing at 70-71º (room temp). In the tank I have 14 Neon Tetras, 2 Metae Cories, 2 Oto cats, 7 amano shrimp and a couple assassin snails. It looks like most of these species have 70-72º for the low end of their recommended temp range. This weekend I'm setting up my new 55 gallon tank (to fix the stocking issues in my current tank!) and my new 300W heateris supposed to be here Wednesday. My question is which would be better for everyone in the tank: leave them at room temp until this weekend when I'm ready to move them into their new tank, or put the 300W heater in the tank as soon as it arrives to get them warmed up? I know it's technically too strong of a heater for the tank, but would it be better short term than the lower temps? Thanks for any advice!