Home depot carries all the tubing you could possibly need, but once you get to 3/4", it's not so cheap anymore. Spirulina poweder can be bought in most health food stores. The other you mentioned, I've never heard of.
the problem with garden hoses comes from them being in the sun/getting warm.. so if you get a new hose and keep it inside you should not have a problem.... or thats atleast what ive heard...... i use vinyl..
The vinyl hose isnt cheap around me it was cheaper to buy a few python hoses than to get the hose at the hardware store.You can look for drinking water safe hose,but that seemed like work lol
for the food go here http://kensfish.com/
great prices great products great guy to deal with.
i was at home depot yesterday, and all their hose are chopped off into 10'. i ive been to a couple of HD and OSH and seems like all their clear hose are by 10'. maybe i didnt look enough but are you guys sure HD carries them?