is it ok to keep marine sponges in the tank ?

If you can get them to grow!
I've tried buying them and never had any luck, but of course there are quite a few which came accidentally and are doing well, with no ill effects that I've observed.
 
I had a nice purple sponge that didnt do so well. It started getting the brown tips and eventually was removed. I think it was due to getting air when doing water changes.
 
I have a purple sponge...I feed live phyto every 2 days and it does pretty well :)
It has def gotten bigger.
I have kept the orange and also the red tree sponges, they have not done well in the long run...I assume this is because of the way they are collected and shipped...sponges are not supposed to be exposed to air.
 
Like the above post once the sponge is exposed to air the chance of survival is slim and a dead sponge can be quite detrimental to a tank!

I respectfully disagree. I have quiet a few small white ones no bigger than a quarter, one of them got the size of a baseball and for no apparent reason withered away to nothing and had no adverse affect on water chemistry. The tank was a 20H.
 
hmm interesting! I have had adverse affects. I work at a coral wholesaler and any corals with sponges on them we have to clean them off because of the adverse affects of them dying and killling the corals! I guess different strains cause different problems.
 
Some sponges contain some nasty toxins that can wreak havoc on a system. Benthic type sponges (fuge, low flow areas, low light areas) generally begin growing when the conditions get right. I've never had any negative effects from die off (when/if they die off, it is usually a slow process, unlike 'purchased' sponges, which can go from nice looking to dead in hours, adding a lot of pollution in one swoop). Many a coral has died from sponges living internal to rocks dying off during shipment. That is one of the bigger issues with freshly shipped live rock, too.

Some sponges tolerate light better than others. I've got a bright blue Haliclona sp. sponge that I've been growing for two and a half years from a fingernail sized piece. I've cut some larger pieces (2 or 3 that were ~1" or so long) as well as a number of fingernail sized pieces and all have continued to do well. They wax and wane in growth spurts (been waning for about 6 or 9 months now, but starting to show signs of growth again). They don't seem to like tons of light, but from a recent dive trip to Acapulco, one dive was almost entirely blue Haliclona, so I got to see them in nature. They were in about 30 to 40 feet of high turbidity water. Current was very mild, I'd say (not much where we were). That tells me that particular species will do best in subdued lighting (not shaded, but not direct) and med flow with lots of detritus.

I've got a purple one that looks a little like Haliclona, but not sure. It is much more sensitive. I fragged some of the blue Haliclona out of water and didn't lose any of it. The trick is to swish as much air out of the sponge when it goes back into the water (violently swishing). I only had the purple out for a short period of time to break the rock up to put frags in different locations, and nearly every bit of it died back to just a small amount in the crevices of each fragment of rock. It all grew back, but then I moved some of it once to a different spot and it did the same (but still grew back). It seems to be less light tolerant as well (though it doesn't die as quickly as non light tolerant sponges).

I've also tried the tree sponges (a red and an orange) and haven't had luck. After my red died way back, I moved the remnants to the back of the tank, under some rock and it is still as large as it was when I put it there eight months ago. I was told by the guy who gave me the blue Haliclona frag that he cuts up colonies if he gets them as soon as he gets them and has higher survival rates. Not sure if the relocation, resizing, or just dumb luck has kept the piees of red tree alive...

They seem to be highly variable in handling tolerance, light tolerance, and flow tolerance. Some may do okay where others in the same conditions may not.
 
Sponges are normally filter feeders and unless you are feeding them directly, they will die back quite quickly. We have a plentiful supply of small sponges in the waters around Cyprus, and I've tried them frequently, ensuring they NEVER come into contact with air when collected, and that all water parameters are as close as possible. In my mind my failure is down to nutrition and incorrect water movement.
Having said all that, if you find a species you like, then do the research on collection sites, and try to match those conditions, then you may be alright; just ask yourself though, even if you are committed to twice a day feeding etc, who will look after the tank if you go away for a week? will they be as meticulous with your regime, because believe me, sponges are unforgiving!
 
The blue Haliclona's have actually grown well for m with no special feeding. They've been in a dirty portion of the system, but nothing out of my way in providing for it. I've only had it for about two and a half years, but so far so good.
 
I remember blue Haliclona! we had a LFS in the UK with a 3000 litre display tank, and before he gave up selling marines, he had a MASSIVE specimen; 'must have been two feet across! vitually every coral I bought from him had some on it!

Definitely the exception to the rule... 'only sad I had to leave my live rock in the UK when I moved to Cyprus, as I haven't seen any out here!
 
I've not found any others that do as well, but I keep hearing about some... I'm going to keep working on the guy that I got mine from to see if he has any gems set back somewhere that have been growing for a while:).
 
Strange. I have a ton of small pineapple sponges and branching sponges that seem to explode in population each time I do a water change and empty my sump. They are all over the walls of the sump, overflow, skimmer. They are pretty neat to look at....and was told is a sign of a healthy tank.
 
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