From fresh to salt..

[wickedfrags]

good you found this forum, as historically most FW to SW conversions are unsuccessful and/or riddled with costly mistakes

does this system have a sump?

also, if you treated the tank historically with copper-based medications (or any medication really), consider replacing the tank as those medications are known to leach out of the silcone...........the price of a new tank is MUCH cheaper than learning that it may be the cause of losses/contamination down the road. Should you think the tank is exspensive........perhaps research further the costs you will be incurring with the conversion.