dehumidifier question

[gmann]

**apologies if I posted in wrong forum**

so ive noiticed that all the windows in my place are covered in condensation, I did a couple of searches and see that the main answer is an HRV or dehumidifier.

Since I don't know if my strata will allow HRV install (still have to read the strata by laws), I was considering a dehumidifier. Just wondering if there is a general rule of thumb of how big a unit I would need? I assume I would place the unit in the fish room?

tank specs are 280g +/- 20g including sump.

also if there is a better option im all ears.

thanks