There was an ad on my local CL not long ago for a free 55 G, stand, and everything else. I was either to late or it was a scam to get phone numbers, that same day I got a call from a number that is a known scam (I found out when I Googled the number.).
I don't think anyone has found a solution to use the paintball "tank".
It seems in CO2 systems the more you pay up front the cheaper it is over time. The Fluval 88g system is around $70, 3 refills are around $40 if you use 1 a month in a year you would be out the same as buying a good...
It looks like you would have to get ahold of the owner of each picture you would like to use and ask there permission.
This is what AGA has on there site. This is there rekease form that the owners of the pictures have to sign. Now if anyone would sue you for using the pictures in a class...
Here are a few points I would like to add about your cycling and filter questions.
You can add the filter at the same time you add the fish. The filter is cycled and will have enough bacteria to clean the fish waste. You will have to stock slowly if you do this so the bacteria can catch up...
I have had my clown pleco for almost 2 years. I didn't know they ate wood until a few weeks ago now it has plenty of wood and it is always eating it. Mine is very teritorial so much so that he chases my convicts when they get to close to it. Before I got the wood it would hide all day now it is...