Thank you for the feedback. Ok. I guess when most people talk about the festiums being 4inch they are talking about females. I guess i will skip them. One of the dangers in collecting advice from others - after your comment - now that I knew what to look for i found a few other folks who had encountered the issue you described that they were far more aggressive as they aged and the males were 6 to 8 inches which would make them a bit problematic. The Laetacara Thayeri might be a better fit from a quick check. One concern is 78 is near the top of their temp range. If i can't find them i could always go with one of the larger apistogramma i guess or maybe one of the acara. I've heard eba are a bit pushy also and not a good fit around angels.I remember talking about the second tank now I think both tanks are viable, I understand the concerns around the activity levels of the Clowns around the Angels but I do think in a 10 by 3 foot tank we are probably going to be ok.
The only thing I would be tempted to look at is the Co2 purely on a feasability side of things, I'm assuming cost isnt too much of an issue for you lol but you would need serious volumes of gas. Have you thought of how to do it? I'd probably look at reactors which work with an inline system on your filters you are meant to get a good distribution from them in big tanks too.
One slightly contentious thing... I would be tempted to just do a big group of Angels, Festiums look nice for their first year or so but when they get big they are kind of ugly IMO, they get really bulky and their fins stay relaxed more than up. Just a personal opinion though An interesting alternative if you could find them might be Laetacara Thayeri? Ocupy the same area, look fantastic and a similar size.
Wills
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I've started thinking about the co2 issue. First i don't intend to maximize co2 input but just add enough to give a boost - around .5 ph drop. I would definitely use a reactor - the difficulty is locating them - as places like co2art does not sell them. Seems most people are interested in small tank with little diffusers. It would have to be on the sump return. Also the sump will be in the basement below the tank which would allow for larger co2 tank - maybe a 20 or 50 lb. I figure a 50lb tank would last 6 to 9 months for both tanks. The local welding shop sells/fills them for not too much. I think the hardest part is going to be finding a quality reactor. I guess if i were smart i would split the co2 to return on all four sump pumps. Not sure i'm looking for examples from other people.