Inches of fish per gallon - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 3 Old 06-16-2008, 01:08 AM Thread Starter
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Inches of fish per gallon

Can anyone tell me what is the largest amount of inches of total fish I could have in a 150g "predator" FOWLR tank. I have a lonely Volitans lionfish right now and I would like to start adding some other, more colorful yet compatible species. Some of the fish I have come up with are the
  • Emperor Angel, a Blue Line Grouper, a Porcupine Puffer, a Blue Hippo Tang, a Snowflake Eel, a Blue Jaw Trigger, a Niger Trigger
. I realize I can't add them all but it's a list to get me started. Oh, and not to be silly or ignorant but would I really have to add the 30" possible for the Snowflake if he doesn't actually swim around? I mean he wouldn't really take up any space hiding in the live rock most of the day. Just curious as to what y'all think as I'm still new to this.

"There's no point in being grown up if you can't be childish sometimes." --Dr. Who
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post #2 of 3 Old 06-16-2008, 09:54 AM
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There is no such rule for a saltwater system. The maximum number of fish depends entirely on the fish selections and their behavior towards each other in the aquarium.

Far more important than the number of fish, is that they have adequate space to grow to a full adult size. The species you list can easily live between 10 and 15 years in captivity. Honestly, a 150 gallon aquarium is not all that large for a marine system. These fish will grow to a minimum of 18'', and some of these fish will grow even much larger. I would personally want to upgrade to a 280 to 400 gallon aquarium within the next few years.

In the mean time, i think you can comfortably keep 3 or 4 of these fish without aggression becoming an issue. I would suggest the Emperor Angel, Niger Triger, and Blue Hippo Tang. You will have plenty of space for them to grow until you are ready to upgrade your aquarium.

The Blue Line Grouper, Porcupine Puffer, and Blue Jaw Trigger all grow at a very fast rate. Despite the willingness of hobbyists to keep these fish in common size aquariums, I feel they are best left for the largest of setups. To many hobbyists think they have achieved success if a fish lives for 3 years. I disagree completely, and for this reason i feel these would all make great fish to add to your future upgraded aquarium size, where they can live a long healthy life.

As to the Snowflake Eel, they are boring fish anyhow. Why even waste the space? You will almost never see the fish. But if you do, then yes, you have to factor in the effect on the bioload, although it will not take up swimming space, as you mention.
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post #3 of 3 Old 08-17-2008, 09:16 AM
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It all depends on the type of fish and you need to factor in agression feeding habits and other requirements
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