Ok... here's my dilema... I have a juwel rio 240 and it's my only tank... At the front on the left hand side there's obviously a gap where the lid is sealed to the tank because i get condensation drips down the front of my tank in one specific spot. I'm shortly going to drain the tank and add some soil subsrate (but keep 50% of the water and not clean the filters... so will be putting my fish straight back in after the rescape)... I want to insert some silicon into the inside rim of the lid to stop the drip... question is, will the silicon go 'off' enough in a few hours? It's not supporting anything, just plugging a gap, so it doesn't have to perfectly set when the tank is filled... but will the fumes cause an issue?