very clean looking water, doesnt mean good quality water
you can not look at water and tell if it is good or bad
Puffers are sloppy eaters and need good size water changes every 3-4 weeks
doesnt matter how good your filter is.
that said the tesselata can cause problems if he is bitting the puffer
maybe you should consider seperating them.
the bigger the ell get the more he will pick on him.
What size tank?
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