Yesterday my gf and I went to the LFS and custom ordered a 7.5 gallon Cube tank (1'x1'x1') to breed snails in and house a betta. The equipment is being bought from bigalsonline.com tonight. As far as I know all I need is a heater and a filter...what else am I missing? What should I feed the snails? The heater is a 50 watt visi-therm stealth heater and the filter is a AC20 powerfilter. I have also read that I need to get a sponge cone to cover the end of the power filter, where can I get that? Oh, my friend at the LFS also said that I will be getting some nuisance snails to breed and feed to the puffers....Oh and I should cycle the snail tank right? Should I treat it like any other tank? With weekly 50% water changes, vaccums and such after the cycle, and can I cycle with snails? or should I use the betta?
Now the puffers

The Dwarf puffers are going to be put in a 15 gallon flat (2'x1'x1'). It has a AC30 powerfilter already on it, a 75 watt visi-therm heater. Tonight an order will go in for an air pump tubing and air stone. Where plants are concerned we are just going to put a bunch of fake ones in. Now the lighting is poor, so should I worry about that? They will get plenty of light from the sun coming through the blinds, but should there be a specific wattage that is run a particular # of hours a day? Also I was told here that 5 puffers would be a good idea, but my friend said 10 would be fine...10 is alot and I dont think I would want 10 in there, what do u guys think?
It also wouldnt be horrible if these guys bred at some time in the future, so what kinda things should I do now to help that happen later?
Thanks so much for reading all of this and please comment, any help will be greatly appreciated