Sounds like a one-gallon is too small for those three fish! Are you talking about a moor, (as a "bubble-eyed fish"), or a telescope, etc.? They can get rather big.

I would not reccomend getting algae eaters-- we have lost 2 fish to them! Sometimes, (not to make this into a horror story, hehe), while the fish are asleep, they will accidentally suck the fish's slime coat off. The fish needs their slime coat to survive, and without it they will die. However, plecos are nice! Don't just get normal plecostomous that you find at petstores!! Those get quite large. If you are looking for plecos, try & get "Dwarf albino bristlenose *or bushynose* plecos". If you can't find these at pet stores, I would probably be able to ship a pair to you, Since I am raising clutches of eggs & babies as I type!

And no, do not use tap water.... chlorine will kill fish on the spot! I would reccomend either using bottled water, or using tap water with a bit of dechlorinator/stress coat in it. (You can also find this at a pet store!)

Hope I was of some help!

>>>Devon<<<