if you really want to get one with an eggsack this is what i have done with mine. 20gal tank with a small hob filter best would be a sponge filter. they don't swim well at that size so it may/will rest on the bottom from time to time. have floating plants for cover and resting. offer fd(freeze dryed) bloodworms a little at a time, if it doesn't eat it is fine, the yolk sack will give it all it needs. it will have the yolk sack a week(with the common size yolk sack at the lfs) or a little more depending on the size of the yolk sack, with the most i have seen was 2 weeks. after it starts to loose its yolk sack it will start to feed on small insects, crushed pellets and fd blood worms. DO NOT have it with anything else. it MUST be alone and the water MUST be 100% cycled. any other questions just ask, but you should look at the sticky i redid as it will answer many questions aswell. gl with your disition, but as said it is early and there will be many many silvers availible without eggsacks if you can wait a month or less. be ready for a monster if you do get it.