Fishlady wrote:
The thermostats on heaters aren't very accurate so you need to gauge the setting based on the reading from a decent thermometer and adjust the heater setting relative to that.

I have numerous heaters by different manufacturers in a variety of tanks and not one is accurate. Some read high, some low unfortunately. If a heater is only reaching 24C when set to 26C, then you need to turn it up to read 28C. That should produce the correct temperature, but monitor by thermometer for a day or two to be sure.

EDIT: Corrected the appalling typos!

DaveGodfrey wrote:
Well in that case you won't have to worry about the digging and the chomping. Push the elodea stems into the substrate and they should root in a few weeks.

DaveGodfrey wrote:
I think I'd keep them bunched myself. Hornwort doesn't produce roots at all, and if you don't weight it down it'll float about, so I'd keep it bunched together and replant it as the goldies dig it up. Elodea does root (although with goldies continually chomping on it and digging it up it probably won't get much chance to). If you've got enough plant weights you could weigh down the individual stems if you wanted.