I would get rid of the domino and blue damsels before you become too attached to them.
20gal is too small an area for 3 damsels.
Yes, clownfish are also part of the damsel family and can get just as territorial if not more so than other damsels... especially maroons.
(Beautiful maroon btw.)
Yes, there are a few success stories from people with established damsels and no troubles (I have a blue damsel and a clown in a 10gal.), but the odds are weighted against you if you ever decide to add any other fish in the future.
You definitely need more live rock... especially if you're going to have multiple fish in a 20.
I can already see algae growing on your sand.
I would also get a small sandsifting goby like a rainfordi, or even a juvenile bullet, diamond, or sleeper goby to keep your sand nice and white.
What kind of clean-up crew do you have?
For that size tank I would think a minimum of 10 snails, 5 hermits, a couple of emerald crabs, and a shrimp or two.
More would probably be better depending on your feeding habits, filtration, sump/fuge/macro setup.
Definitely add at least 1 powerhead to get some circulation in that tank.
Looks like tons of dead, stagnant areas that are just begging to grow some cyano or other nuisance algae.
The benificial nitrifying bacteria on your rocks and sand can only filter the water that actually moves over them.
No circulation, no filtration.
I might be a little biased because of my latest purchase, but I would recommend getting a Hydor Koralia #1 from Patrick at ReefLife while he still has them on sale.
A single Koralia #1 will get flow to every corner of your tank without making a sandstorm and for under $30 to boot.
If you're a little tight on cash I can loan you a couple of my old powerheads till you get something better.
If you're not going to add a fuge or a skimmer to that tank anytime in the near future then I would advise putting some macroalgae in the tank, and doing the 20% water changes weekly that someone else mentioned earlier in the thread.
If you do add a fuge and/or skimmer then you can probably cut down your weekly water changes to 10%.
What's the stock lighting that came with that hood?
Is it incandescent or fluorescent?
Depending on the wattage of the bulbs you might be able to grow some mushrooms and zoas without upgrading your lights.
Of course, if you can upgrade, all the better.
Lighting is the largest limiting factor outside of physical tank size in this hobby.
Whoever steered you over here did the right thing by you.
This is a great bunch of guys and gals, and they're more than willing to bend over backwards to help out a local member.
Everyone I've met in FMAS has been a godsend.
I wouldn't be halfway to where I am without all the sage advise and super generosity from everyone I've met here.
Welcome to the club!
