so you know, ive done no testing of water, i have a 100 watt heater, ive checked the temp. and everything seems fine (also a 20 gallon. filter). okay, i have a 20 gallon tank with 3 green spotted puffers. all bought at the same time. same place. and introduced to there new home at the same time. these 3 fish are the only inhabitants of the tank. but im a bit worried and dont know what to do because i have a little log shaped thing for them to hide in, witch was fine at first. but here is what happened. i put the fish in the tank, all three where going up and down the glass (i dont know why) then fish 1 started to calm down after a couple of hours, finding the log a nice place to hide, then fish 2 did the same, all was fine until fish 1 became very territorial, any time fish 2 can near the log he/she would chase fish 2 away. fish 2 getting tiered of being pushed around decided to ignore the log and find a new place to hide. although the only other things in the tank are plants, so it just roams around near the gravel, im worried that if i get another rock/log for fish 2, fish 1 will take that one over too and fish 2 will be afraid of going into both. what should i do?
get another rock/log or get rid of fish 1?
also im worried there is something wrong with fish 3 because it is still going up and down all over the glass very fast, what does this mean?? is it sick? or stressed??? please help!!!