Substrate heaters aren't designed to heat the tank (and I've been told they can't in most cases, that the wattage is much too low?), they're designed to theoretically promote plant growth through keeping convection currents going through the substrate, stimulating the roots.In theory, a substrate heater can keep a tank warm on fewer watts of electricity. Haven't used one myself, so can't say if this is true or not. Also, it won't be affected by water changes, because even if you changed 90% of your water, the heating element would still be submerged. From a visual standpoint, it is concealed, so could make for an attractive look.
However, it doesn't sound like a good idea in a planted tank.
Yeah, the aliens put them there to keep their larvae warm, which are implanted into the mud to protect them until they have time to metamorphose into adult aliens.Don't roots add O2 and create all the current that they require anyway?
How do they live in natural systems?
Are there heat cables in the Evergaldes?
In The Pantanal? The Ovakango??
How do plants manage?
Where is the evidence that suggest cables help aquatic plant roots in any research article anywhere?(I've asked this for that last 20 years, never one answer).
And, as far as I know, they don't have Excel in streams.In nature, the beds of shallow streams and rivers are warmer than the water.
Guess what? They do sell a substrate heater. It's called a "Growth Plate." :icon_biggEven more people would use them if ADA sold them.
So why is it when I put my feet into the sand/gravel, mud, the temperature is warmer than the water?In nature, the beds of shallow streams and rivers are warmer than the water.