I have a 46 gallon acrylic, rena xp3 filter, low light. I understand acrylics retain heat better than glass. Any recommendations as to which heater is best? Size/wattage? Thanks.
Get the hydor ETH inline 300 watt 5/8". It costs more than the Rena inline but, it heats the water going into the tank, not when it's leaving. I heat a 46 gallon in the basement with the Hydor. The ambient temperature will drop into the high sixtys in the winter but, the tank temperature never varies from the 78 degrees I have it set at. I should have bit the bullet and spent the $50.00 years ago. Yeah, it's not in the tank.Or a Hydor ETH inline.
Nice to have less equipment in the tank. =)
BTW- Welcome to TPT!!