.

[piatotsini]

.

 

[MegTheFish]

Why would topping off a tank be bad?

 

[tttnjfttt]

Yes, it is worse to frequently top off your tank, that will lead to old tank syndrome, whihc is the build up of minerals and metals.

Exactly how hot is your tank getting durring the day? Is it posible to only open the lid at certain times and blow a fan over it?

 

[Bignose]

1) if you use a dechlorinator that neutralized heavy metals, that shouldn't be an issue

2) if you have any kind of decaying plant matter, or tannins, those dissolved organic chemicals will also bind to and neutralize heavy metals

3) if you do water changes frequently enough and top off in between, the percentages of the mineral buildup will be only like 125% of what is normaly in the tap water anyways

4) if you are super concerned about it, top off with RO or distilled water

So, keep up your weekly water changes, and it really isn't an issue.