I have a frog fish tank and I find some large crushed rubble in the bottom is great he can walk around lots, not too too much rock I find when you feed him the less rock the more often you will get to see him eat. I also feed mine gold fish (I know its not the best but they are cheap) Starve him for a week then put in a bright gold fish and you will see him eat. Also when he has his hod out that means he is hunting. Plus run a huge skimmer they poop lots. My frog fish is about 6 in and eats 3 large goldfish a week, Its great to watch. I tried feeding him cromis's but he ate one and one is still in the tank 2 months later.
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