2 questions

[trigger reid]

i am going to set up a 90 gallon tank with an undulate trigger my question is what is the bigest size of undulate could i put in it and what is the bigest undulate you have seen at your local fish store

 

[beach bum]

I suppose you could put the biggest one you want in there, but the biggest I have ever seen for sale was 4-4.5 inches.
hth,
bb

 

[trigger reid]

what filtration should i have?