We grabbed 2 syamese fighters, 2 angel fish, around 15 neons, 3 'sucker' fish (Are they actually named that I can't remember, they cleaned the place though), 2 previous gold fish & a couple frogs.
Wow, were all these together? If so, with all due respect, did you find your fish stock diminish quickly?
If not you’re very lucky as angel fish don’t tend to like neons, sometimes each other. Also if the Siamese fighers (bettas) were males then almost always do they attack each other (you can get away with 1x male and 1x female, or 2x females, but 2x males is a bad idea). Siamese fighters make terrible community tank mates, especially the typical veil tale variety local fish stores stock. Plakats are the only betas I would say could make it long-term in a community tank due to minimal finage, but I wouldn’t advise on it.
To the op, fish keeping is a great hobby but can be as involved as the world of computers if you want it to be!
70ltr tank – I would stick to tropical. You’re talking four figures for marine and probably ~£100 for tropical.
Also, the typical rule of thumb is 1” of fish (fully grown) per UK gallon of water.
Some advice I’d give anyone looking to start in the hobby:
1) Take a look at some fish related forums (I’m on FishForums.net mainly) and have a good read on there as there are dozens of people that have asked the same questions as you with some very good answers (not saying you wouldn’t get good answers here).
2) Getting things right from the start will pay dividends in the long run. What do you want out of the tank? Do you want live plants? If so then you may want to choose fish that won’t devour them. Do you want a specific type of fish, e.g. figure 8 puffer then that’s a brackish fish and not a community fish so you may really want one of those but as you haven’t planned ahead then you can’t.
Cycling the tank - there is no harm in cycling the tank once you have the filter and substrate. This way, after a couple of weeks you can go in and buy fish rather than having to wait longer, having not started cycling the tank.
You may read that you can cycle a tank with fish in it – I really advise against this as it stresses the fish out and often they die.
If you’re in a big hurry to get going then borrow some seeded filter media from a friend (in a bag of their tank water) and put that in yours – you’ll find the tank can cycle in a matter of a few days, but that’s depending how good the tank you’re taking the media from actually is.
You can get around water quality issues with various lotions and potions the fish stores will try and sell you, some are good but if your local store sells reverse osmosis (RO) water then that can really get you off to a good start, plus using 20% RO water per water change will help keep things ticking over nicely. RO is extremely useful if you are treating diseases in the tank.
3) The type of substrate (gravel, sand etc) you use will determine the types of fish you would be best to keep. My advice on sand in a tropical tank... don’t. I bought lovely white silica sand for a tank, looked stunning, cost a fortune, and looked cr@p about a day after due to the poo and bits of plant. Sand is also terrible for certain types of fish so my advice again is steer clear.
I personally have gone for fine lava gravel (can’t remember what it’s called) but it’s damn expensive but is great for planted tanks, not so for specific fish – see point 4. Fine pea gravel is perfect as well.
Don't be tempted to get sand from the beach or somewhere else if you do choose to go down that route - sand will contain salt (and other things in some instances) which unless you're going for a brackish (partial salted) tank then it will kill the fish. Inert sand such as silica sand (best bet) or play sand (not always 100% inert) is fine.
Don't be tempted with coloured gravel - it's crap and will colour your water.
4) Fish such as corydoras (corys), clown loach, catfish and plecos are very popular but these are all bottom dwellers. It won’t be very interesting if you only have bottom dwellers so perhaps research fish that are also mid to upper range which will give you something to look at.
On the subject of corydoras (cory’s) and clown loach – these are typically very popular due to their colours/look but remember clown loach can get big and both of these types of fish tend to do better in small groups of 3+.
Corys, clown loaches and certain plecos (e.g. any bristlenose pleco) need fine substrate to dig about in, anything coarse or large will wear down their barbles (or beards as my daughter calls them) and isn’t very pleasant for them. Just to keep that in mind.
5) Filteration is impotant. If you can, get yourself an external filter – they are easier to clean and I’ve always justified the expense as it allows me more inches of fish per gallon of extra water the canister holds!
Little tip – fish always look hungry but you don’t need to feed them more than every other day. I’ve had fish for 20 years and never fed them every day. It pollutes the water quicker (either through uneaten food rotting, or more faeces rotting at the bottom of the tank).
I tend to go by the rule of however much food the top feeders eat in 1 minute is enough. Don’t forget if you have corys or bottom feeders, tablets or a small amount of brine shrimp (something that will sink) is needed.
6) Trust your research and advice of enthusiasts over fish store advice – not to tar everyone with the same brush as there are some very experienced owners/workers in these places, but they are few and far between in my experience and money matters more in a lot of these places, than the welfare of the fish.
Certain fish have a bigger appeal and as they sell well you are unlikely to be told that they don’t make good community tank-mates. For example:
- Red tail sharks can be a right pain in the neck and bully other fish.
- Tiger barbs likewise, these can be bullies (especially with other tetras such as neons)
- Frogs, lobsters or similar... not really good for a community tank
- Mixing tetra varieties can be a bit hit and miss as well.
- Angelfish don't make good community tank mates IMO - sometimes they can attack each other as well
- Siamese fighers (or betas), if you want one, get a small little tank (they will go for guppies usually and sometimes swordtails)
- Oddballs – there are some weired fish out there but do your research as I’ve made many mistakes by randomly buying and often times ending up attacking or being attacked.
Of course there are examples of people that have had one of these fish in a community setting and have had no problems – that’s more luck than anything else. I'm just giving my advice from my experience and research.
Good community fish are neons, guppies, danios (zebra etc), swordtails, most gouramis, catfish (do your research on these), certain plecos (some get HUGE), mollies, platies, rasboras to name a few.
I believe the forum mentioned at the start have some
beginners guides that are excellent and covers points I've raised much better than I've stated. As with any hobby, there is a learning curve so hopefully if this stuff is all new to you I haven't put you off as it is a really nice hobby to get into.
Good advice above from UTmaniac