6 four inch red belly pirahna. Thinkin about adding a protein skimmer sized for a 100 gal because i will soon be moving and prob go with a 90 gallaon tank and just keep 5. Buddy of mine is going to take one off my hands,
I have always been told that a good rule of thumb for ample filtration is ten times the tank sizer per hour. EX 30 gallon tank= 300 gph. It might be overboard but its better to have to much then to have to little unless the flow rate is pushing the fish around. I have 500 gph on a 75 gallon community tank and it is doing fine, but the bioload is a lot less then that of 6 pirahna's.
I would go with the bigger tank, multiple pirahna's are to much for a 30 gallon tank IMO.
6 rb's in a 30g is way too many fish for that tank. Pirahna are very messy eaters and can grow to 10" or more. The uneaten food and the bioload from 6 pirahna's in a 30g is way too much for a fluvall 205 to handle without wc every 3 days. I would upgrade the 30g to atleast a 55g, add an Emperor 400 Bio-wheel(rated at 400gph)or a Penguin 350 (rated at 350gph), top it off with a filtered powerhead and you should be good for a long time.
Thanks for for the advice and I'm down to four now and goona add an eco aqualizer it gets reeally good reviews and I guy even took to nasa not telling them what it did and it does exactly what it claims which is breaking the web of h2o molecules so that waste con be better filtered and I,m looking for a 90gal if anyone knows where a goo deal is.
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