I left a review to make a bigger report. But I also bought this set. I use large 5 gallon vases so these guys fit well although the large one was too big. As soon as I put them in the tanks, the guys immediately went to them. I have a boy who has a strong desire to protect the nest. I turn off the pumps at night so they can sleep in still water. This boy has floating driftwood right next to the pump outlet. Every night he builds a nest and so proudly stands guard. and i feel so bad because i have to turn his pump on and he gets so upset and attacks the outlet. then chases his bubbles and tries to catch them. I hope he builds his nest in this little tree trunk. even if it doesn't work out, maybe his little heart won't get broken every morning ;) NOTE: you must attach them where your water flow moves them through the tank. unless it affects you, of course.
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